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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0001" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0007">Introduction</span><p id="para0005" class="elsevierStylePara elsevierViewall">Phenylketonuria &#40;PKU&#41; is an autosomal recessive disorder caused by phenylalanine hydroxylase &#40;PAH&#41; gene mutations&#44;<a class="elsevierStyleCrossRef" href="#bib0001"><span class="elsevierStyleSup">1</span></a> causing partial or total deficiency of the PAH enzyme&#44; which converts phenylalanine &#40;Phe&#41; into tyrosine &#40;Tyr&#41;&#46; The accumulation of Phe-results in tissue toxicity&#44; especially in the central nervous system&#46;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a> The clinical phenotypes are usually classified as classical PKU&#44; characterized by plasmatic Phe-levels above 1200 &#956;mol&#47;L defined by tandem mass spectrometry &#40;20&#160;mg&#47;dL by fluorometric immunoassay&#41;&#59; and mild PKU&#44; when Phe-levels remain between 360 and 1200 &#956;mol&#47;L &#40;6&#8211;20&#160;mg&#47;dL&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a> According to European guidelines&#44;<a class="elsevierStyleCrossRef" href="#bib0003"><span class="elsevierStyleSup">3</span></a> patients with levels above 360 &#956;mol&#47;L &#40;6&#160;mg&#47;dL&#41; should be treated to achieve a therapeutic goal of Phe-between 120 and 360 &#956;mol&#47;L &#40;2&#8211;6&#160;mg&#47;dL&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0001"><span class="elsevierStyleSup">1</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a> At the time of this study&#44; the treatment for newborns adopted by Brazilian institutions is recommended only for cases with levels above 10&#160;mg&#47;dL or 600 &#956;mol&#47;L&#46;<a class="elsevierStyleCrossRef" href="#bib0004"><span class="elsevierStyleSup">4</span></a></p><p id="para0006" class="elsevierStylePara elsevierViewall">To ensure a better prognosis&#44; children with PKU must be submitted to a low-protein diet to control plasmatic Phe-levels as early as possible&#46;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a> The time from birth to 12 years of age is a crucial period to maintain stable Phe-levels to preserve neurodevelopment&#46;<a class="elsevierStyleCrossRef" href="#bib0003"><span class="elsevierStyleSup">3</span></a> Moreover&#44; diet therapy should be lifelong&#44; since variations in Phe-may result in neurological damage&#44; leading to intellectual deficiency&#44; hyperactivity&#44; and deficits in Executive Functions &#40;EF&#41; and Social Cognition &#40;SC&#41;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">5</span></a>&#46; EF skills enable individuals to engage in goal-directed activities and SC is important to regulate behavior through understanding other people&#39;s intentions or feelings&#46;<a class="elsevierStyleCrossRef" href="#bib0006"><span class="elsevierStyleSup">6</span></a> There is evidence that an increase of 100 &#956;mol&#47;L in Phe-level predicts a decrease of 1&#46;3 to 6 points in intelligence quotient &#40;IQ&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0003"><span class="elsevierStyleSup">3</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0007"><span class="elsevierStyleSup">7</span></a> Therefore&#44; dietary adherence is important to provide metabolic stability and guarantee cognitive development&#46;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0003"><span class="elsevierStyleSup">3</span></a></p><p id="para0007" class="elsevierStylePara elsevierViewall">Although nutritional treatment has been shown to improve cognitive and behavioral outcomes&#44; neuropsychological dysfunctions have been reported even in individuals submitted to early intervention&#46; The SC and EF domains seem particularly vulnerable to long-term variations of Phe-levels&#46;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a> Inhibitory control<a class="elsevierStyleCrossRef" href="#bib0008"><span class="elsevierStyleSup">8</span></a>&#44; working memory<a class="elsevierStyleCrossRef" href="#bib0009"><span class="elsevierStyleSup">9</span></a>&#44; cognitive flexibility<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">10</span></a> and verbal fluency<a class="elsevierStyleCrossRef" href="#bib0011"><span class="elsevierStyleSup">11</span></a> impairments are usual and prevail in children with delayed diagnosis without intellectual impairment&#46;<a class="elsevierStyleCrossRef" href="#bib0012"><span class="elsevierStyleSup">12</span></a> Therefore&#44; the extent of the effects of fluctuations in&#44; and high concentrations of&#44; Phe-on neurodevelopment must be better understood&#46;</p><p id="para0008" class="elsevierStylePara elsevierViewall">This study was designed to analyze the effects of individual variability in Phe-levels on cognitive outcomes in Brazilian PKU children&#46; The authors hypothesized that poor metabolic control&#44; demonstrated by elevated mean Phe-levels in follow-up&#44; would be associated with worse cognitive outcomes&#46; Therefore&#44; the authors aimed to 1&#41; compare intellectual&#44; EF and SC performance of PKU and typically developing children&#59; 2&#41; investigate associations between performance and Phe-fluctuations in the PKU group&#46; Results may provide insights into the PKU neurocognitive phenotype that could be useful for clinical approaches&#46; The interest in FE and CS skills was due to their associations with psychosocial outcomes&#44; such as school performance and peer interaction in the short and mid-terms&#44; and on quality of life in the long term&#46;</p></span><span id="sec0002" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0008">Methods</span><p id="para0009" class="elsevierStylePara elsevierViewall">This cross-sectional exploratory study undertook a quantitative analysis of the neuropsychological performance of children with PKU compared with age-matched healthy controls&#44; approved by the local Ethics Committee &#40;UNIFESP&#47;protocol 2&#46;879&#46;610&#41;&#46; All legal guardians provided informed consent and children provided assent for participation&#46;</p><span id="sec0003" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0009">Participants</span><p id="para0010" class="elsevierStylePara elsevierViewall">Twenty-seven children of both sexes diagnosed with Phenylketonuria &#40;PKU group&#41; and 28 children with neurotypical development &#40;control group&#41; aged between 7 and 15 years participated in the study&#46; Children with PKU were recruited from those in clinical follow-up at Instituto J&#244; Clemente &#40;IJC&#41;&#44; a referral center for newborn screening&#46; Control participants were recruited from public and private schools&#46;</p><p id="para0011" class="elsevierStylePara elsevierViewall">The PKU group was dichotomized according to baseline Phe-levels &#40;i&#46;e&#46; before diet therapy&#41; into &#34;classical PKU&#34; &#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;14&#41;&#44; with levels above 1200 &#956;mol&#47;L &#40;&#62; 20&#160;mg&#47;dL&#41;&#59; and &#34;mild PKU&#34; &#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;13&#41; with levels between 360 and 1200 &#956;mol&#47;L &#40;6&#8211;20&#160;mg&#47;dL&#41;&#46; Exclusion criteria for the PKU group were lack of regular diet therapy and attendance at follow-up&#59; for controls were reports of learning disabilities&#44; and neurological or psychiatric disorders&#46;</p><p id="para0012" class="elsevierStylePara elsevierViewall">All PKU participants presented Phe-levels above 4&#160;mg&#47;dL until the 15th day of life&#46; They were diagnosed in basic health units or maternity hospitals between the 3rd-5th day of life&#46; Soon after diagnosis&#44; children were referred for clinical follow-up with a multidisciplinary team&#46; After a new assessment of Phe-levels to confirm PKU&#44; nutritional management of Phe-ingestion comprising diet therapy and regular monitoring of levels was started&#46; The frequency of return visits varies according to age&#58; a&#41; weekly for children between 0 and 6 months of age&#59; b&#41; fortnightly for 6&#8211;12 months&#59; c&#41; monthly for 1&#8211;2 years&#59; d&#41; quarterly for those over 2 years old&#46; Follow-up includes psychological evaluations to monitor neurocognitive development&#46;</p></span><span id="sec0004" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0010">Clinical characteristics</span><p id="para0013" class="elsevierStylePara elsevierViewall">Clinical &#40;PKU phenotype&#44; Phe-levels&#41;&#44; socio-demographic &#40;age&#44; sex&#44; maternal education&#41;&#44; and anthropometric &#40;body mass index&#41; variables of PKU participants were collected from medical records&#46; Phe-levels were obtained by fluorometric method following Brazilian guidelines<a class="elsevierStyleCrossRef" href="#bib0004"><span class="elsevierStyleSup">4</span></a> and performed by an expert&#46; All met the necessary requirement to minimize the Phe-fluctuation as much as possible in the follow-up sampling&#58; blood collection always at the same time in the morning&#59; a 3-hour fasting period before the measurement of Phe&#44; and the child&#39;s last meal before testing consisted of a Phe-source food&#44; with the amount of amino acid prescribed by the dietician&#46; The examination is part of the follow-up routine to monitor Phe-levels&#46;</p><p id="para0014" class="elsevierStylePara elsevierViewall">Four measures of the Phe-levels of each participant were considered&#46; The first was collected after birth and defined the PKU phenotype&#46; The classical PKU phenotype presented mean Phe-levels of 31&#46;2&#160;&#177;&#160;10&#46;5&#160;mg&#47;dL and the mild PKU had a mean of 15&#46;1&#160;&#177;&#160;3&#46;81&#160;mg&#47;dL&#46; The other measures comprised the last three blood samples obtained before inclusion in the study&#46; Individual fluctuations in Phe-levels were defined as a percentage variation from the last blood sample&#44; i&#46;e&#46; relative variation &#40;&#37;variation Phe&#160;&#61;&#160;SD&#42;100&#160;&#61;&#160;X<span class="elsevierStyleItalic">&#47;</span>M&#41;&#46; The study member that executed the neuropsychological assessment was blinded to the PKU phenotype and to historical Phe-levels&#46;</p></span><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0011">Neuropsychological investigation</span><p id="para0015" class="elsevierStylePara elsevierViewall">The neuropsychological assessment included intellectual&#44; EF and SC measures&#46; For PKU children it was combined with regular clinical visits and performed individually in appropriate rooms at IJC&#46; Controls were assessed in noise-controlled rooms at their schools&#44; without prejudice to routine activities&#46;</p><span id="sec0006" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0012">Intellectual performance</span><p id="para0016" class="elsevierStylePara elsevierViewall">The validated Wechsler Abbreviated Scale of Intelligence &#40;WASI&#41;<a class="elsevierStyleCrossRef" href="#bib0013"><span class="elsevierStyleSup">13</span></a> was used to assess intellectual performance&#46; The WASI provides three main index scores&#58; full intelligence quotient &#40;IQ&#41;&#44; verbal &#40;VIQ&#41;&#44; and performance IQ &#40;PIQ&#41;&#46;</p></span><span id="sec0007" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0013">Neuropsychological assessment</span><p id="para0017" class="elsevierStylePara elsevierViewall">The developmental neuropsychological battery NEPSY-II adapted to Portuguese was used to investigate EF and SC&#46;<a class="elsevierStyleCrossRef" href="#bib0014"><span class="elsevierStyleSup">14</span></a> The battery covers ages 3&#8211;16 years and is widely used in studies with neurodevelopmental disorders&#46; Reports with clinical samples in the manual indicate high-reliability coefficients &#40;rs&#160;&#61;&#160;0&#46;85&#8211;0&#46;87&#41;&#46; Raw scores were used for analyses&#46;</p><p id="para0018" class="elsevierStylePara elsevierViewall">The subtests of the <span class="elsevierStyleItalic">Attention and Executive Functions domain</span> were used&#58; Animal Sorting &#40;AS&#59; assesses cognitive flexibility&#41;&#59; Auditory Attention &#40;AA&#59; selective attention&#41;&#59; Response Set &#40;RS&#59; auditory attention and vigilance&#41;&#59; and Inhibition &#40;IN&#59; inhibitory control and shifting&#41;&#46; The protocol also included the digit span and Corsi block-tapping tests of working memory&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">15</span></a> Scores were the extent of digits &#40;maximum 8&#41; or cubes &#40;maximum 7&#41; repeated backward&#46; The number of animals starting with given letters &#40;F&#44;A&#44;S&#41; generated in 60&#160;s was the measures of semantic and verbal fluency&#44; respectively&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">15</span></a></p><p id="para0019" class="elsevierStylePara elsevierViewall">The validated Behavior Rating Inventory of Executive Functions &#40;BRIEF&#41; completed the EF assessment&#46;<a class="elsevierStyleCrossRef" href="#bib0016"><span class="elsevierStyleSup">16</span></a> The main caretaker answered 86 questions about behaviors observed at home as &#34;never&#34;&#44; &#34;sometimes&#34;&#44; and &#34;often&#34;&#46; A threshold above 65 indicates a clinical profile&#46;</p><p id="para0020" class="elsevierStylePara elsevierViewall">Social Cognition &#40;SC&#41; was assessed using the subtests of Affect Recognition &#40;AR&#41; and Theory of Mind &#40;ToM&#41;&#46; The AR assesses children&#39;s ability to identify basic emotions in faces&#46; The ToM assesses abilities to interpret beliefs&#44; intentions&#44; thoughts&#44; and emotions from another person&#39;s perspective&#44; among others&#46;</p></span></span><span id="sec0008" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0014">Emotional and behavioral assessment</span><p id="para0021" class="elsevierStylePara elsevierViewall">The Child Behavior Checklist &#8211; CBCL adapted for Brazilian children<a class="elsevierStyleCrossRef" href="#bib0017"><span class="elsevierStyleSup">17</span></a> answered by caretakers was used for behavioral assessment&#46; It comprises 113 questions about everyday behavior with responses being &#34;not true&#34;&#44; &#34;sometimes&#47;somewhat true&#34; and &#34;very often true&#34;&#44; proving quantitative indices related to internalizing &#40;somatic problems&#44; anxiety&#44; depression&#41; and externalizing &#40;rule-breaking behavior&#44; aggressive behavior&#41; profiles&#46; A t-score &#62; 65 indicates a clinically meaningful threshold&#46;</p></span><span id="sec0009" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0015">Statistical analysis</span><p id="para0022" class="elsevierStylePara elsevierViewall">Statistical analysis was performed using the JAMOVI software &#40;version 2&#46;3&#46;22&#41;&#46; Descriptive statistics presented categorical data as absolute and relative frequencies&#44; and numerical data as mean &#177; standard deviation&#44; median&#44; and confidence intervals when applicable&#46; Generalized Linear Models &#40;GzLM&#41; were used to investigate differences in IQ between groups and identify the impact of variations among Phe-levels on dependent variables&#46; Multivariate analysis of covariance &#40;MANCOVA&#41; was used to identify the effects of groups in a set of dependent variables adjusted by age and IQ&#46; Finally&#44; univariate&#44; and multivariate linear regression analyses were performed to identify the clinical variables with the greatest impact on discrimination between groups&#46; The level of significance adopted was <span class="elsevierStyleItalic">p</span> &#60; 0&#46;05&#46;</p></span></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0016">Results</span><p id="para0023" class="elsevierStylePara elsevierViewall">Clinical characteristics were similar in both groups&#44; although the control group had more patients below 10 years of age &#40;<a class="elsevierStyleCrossRef" href="#tbl0001">Table 1</a>&#41;&#46; Therefore&#44; age was added as a covariate to avoid any confounding results&#46; Since no significant difference was observed in IQ between the classical and mild phenotypes &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;415&#41;&#44; the PKU patients were not dichotomized into subgroups for the comparative analysis with the control group&#46;</p><elsevierMultimedia ident="tbl0001"></elsevierMultimedia><p id="para0024" class="elsevierStylePara elsevierViewall">Participants with PKU presented significantly lower IQ scores compared to controls &#40;89&#46;8&#160;&#177;&#160;10&#46;8 versus 109&#46;0&#160;&#177;&#160;9&#46;5&#44; <span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#44; respectively&#41;&#44; with both VIQ &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41; and PIQ &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41; different among groups&#46; Thus&#44; IQ was also treated as a covariate in the MANCOVA for EF and SC&#46; The aim was to understand whether the EF and SC performance would be more explained by intelligence level rather than PKU presence&#46;</p><p id="para0025" class="elsevierStylePara elsevierViewall">In the EF analysis adjusted by age and IQ&#44; significant differences between the control and PKU groups were observed only in the set of executive attention subtests &#40;RS&#41; of NEPSY-II &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;029&#41;&#46; The authors found significant associations of age with the following EF tasks&#58; executive attention &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;017&#41;&#59; verbal fluency &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41;&#44; phonemic fluency &#40;<span class="elsevierStyleItalic">p</span>&#160;&#8804;&#160;0&#46;001&#41;&#44; and semantic verbal fluency tasks &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41;&#59; working memory &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41;&#59; cognitive flexibility &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;0021&#41;&#59; and inhibitory control &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41;&#46; Yet&#44; IQ was only associated with working memory &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;013&#41;&#44; cognitive flexibility &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;012&#41;&#44; and inhibitory control &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;003&#41; outcomes&#46;</p><p id="para0026" class="elsevierStylePara elsevierViewall">The SC set of variables &#40;<a class="elsevierStyleCrossRef" href="#tbl0002">Table 2</a>&#41; was significantly different between groups &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;003&#41;&#44; adjusted by age and IQ&#46; Groups differed significantly in the affective recognition &#40;AR&#41; task &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41;&#44; but not in ToM &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;345&#41;&#46; Age was associated with the overall SC scores &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41; and with both AR &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41; and ToM &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41; tasks&#46; No significant associations were observed between IQ and the SC set of variables &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;955&#41;&#46;</p><elsevierMultimedia ident="tbl0002"></elsevierMultimedia><p id="para0027" class="elsevierStylePara elsevierViewall">In the PKU group&#44; the mean time variation among the collection of the three blood samples was 4&#46;07&#160;&#177;&#160;1&#46;67 months&#44; maintaining stable fluctuations &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;225&#41;&#46; The Phe-levels were 7&#46;56&#160;&#177;&#160;3&#46;10&#160;mg&#47;dL at the first collection&#44; 7&#46;49&#160;&#177;&#160;3&#46;59&#160;mg&#47;dL at the second&#44; and 7&#46;76&#160;&#177;&#160;3&#46;90&#160;mg&#47;dL at the last&#46; Individual mean variations of Phe-levels were 2&#46;21&#160;&#177;&#160;1&#46;50&#160;mg&#47;dL&#44; which corresponded to a variation of 32&#46;1&#160;&#177;&#160;21&#46;0&#37; between collections&#46; To ensure the detection of relative oscillations in Phe-levels in PKU patients&#44; the percentage change between the three time periods was used to define individual variation&#46;</p><p id="para0028" class="elsevierStylePara elsevierViewall">Relative Phe-variation was not correlated with total IQ &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;32&#44; <a class="elsevierStyleCrossRef" href="#tbl0003">Table 3</a>&#41;&#44; or with verbal &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;96&#41; or performance &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;205&#41; quotients&#46; Among EF tests&#44; relative Phe-variation was significantly correlated only with Corsi task scores and working memory index &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41;&#46; Relative Phe-variation was associated with phonemic verbal fluency scores &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;004&#41; and inhibitory control index &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;035&#41;&#46; Considering SC variables&#44; it was associated with ToM test scores &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;003&#41;&#46;</p><elsevierMultimedia ident="tbl0003"></elsevierMultimedia><p id="para0029" class="elsevierStylePara elsevierViewall">Finally&#44; the authors investigated whether the percentage change in Phe-would be a determinant for behavioral problems and EF&#44; as reported by the main caretakers&#46; Relative Phe-variation was not correlated with CBCL scores related to internalizing profile &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;33&#41; nor to externalizing profile &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;52&#41;&#46; In the BRIEF&#44; relative Phe-variation was associated with inhibition &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;04&#41;&#44; initiative &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;05&#41; and working memory &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;04&#41; scores&#44; and overall executive functioning index &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;05&#44; <a class="elsevierStyleCrossRef" href="#tbl0004">Table 4</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0004"></elsevierMultimedia><p id="para0030" class="elsevierStylePara elsevierViewall">The authors also investigated which anthropometric and sociodemographic variables might be predictors of Phe-variation&#46; The authors considered the following variables&#58; age&#44; sex&#44; body mass index &#40;BMI&#41;&#44; maternal educational level&#44; type of PKU&#44; and the concentration of blood Phe-present in the first clinical examination&#46;</p><p id="para0031" class="elsevierStylePara elsevierViewall">In the first analysis &#40;Table S1&#41;&#44; the authors assessed the association of each variable separately &#40;univariate&#41;&#46; The authors considered the variables presenting <span class="elsevierStyleItalic">p</span> &#60; 0&#46;15 to compose the multivariate analysis and determine potential predictors&#46; The authors identified age &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41; and BMI &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;112&#41; as possible predictors of Phe-variations&#46; However&#44; multivariate analysis showed that only age was an independent predictor for Phe-variations &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;002&#41;&#46;</p></span><span id="sec0011" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0017">Discussion</span><p id="para0032" class="elsevierStylePara elsevierViewall">This study investigated EF and SC in a sample of children with classic and mild PKU undergoing diet therapy&#46; Results suggest that poor metabolic control&#44; demonstrated by uncontrolled Phe-levels&#44; has a selective negative effect on cognitive domains&#44; but not on intellectual performance&#46; Phonemic verbal fluency&#44; visuospatial working memory&#44; EF and ToM skills were shown to be the most susceptible to worse metabolic control&#46; There was no evidence of associations with internalizing or externalizing behavioral problems&#46;</p><p id="para0033" class="elsevierStylePara elsevierViewall">An initial topic of discussion concerns the association between metabolic control and intelligence&#46; Children with PKU showed significantly lower IQ scores compared to controls&#44; even in average ranges&#46; These findings are similar to Gassi&#243; et al&#46;<a class="elsevierStyleCrossRef" href="#bib0018"><span class="elsevierStyleSup">18</span></a> results with a similar number of participants &#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;37&#41; and mean Phe-values &#40;444&#160;&#177;&#160;145&#956;mol&#47;L&#59; i&#46;e&#46; 7&#46;33&#160;&#177;&#160;2&#46;39&#160;mg&#47;dL&#41;&#44; revealing IQs levels &#40;100&#160;&#177;&#160;11&#46;0&#41; lower than controls &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41;&#46;</p><p id="para0034" class="elsevierStylePara elsevierViewall">In the present study&#44; Phe-variations did not predict IQ&#44; which differs from previous findings as described by Hood et al&#46;<a class="elsevierStyleCrossRef" href="#bib0019"><span class="elsevierStyleSup">19</span></a> in a sample of 47 children followed from birth to 10 years of age&#44; where variations in Phe-levels were negatively correlated with IQs&#44; although IQ was still average&#46; Such results may be explained by the greater variability of Phe-in their sample &#40;202&#46;4&#160;&#177;&#160;84&#46;4&#956;mol&#59; 3&#46;34&#160;&#177;&#160;1&#46;39&#160;mg&#47;dL&#41;&#46; Conversely&#44; lower IQs have been associated with plasma concentration values obtained at the time of assessment and not with fluctuations in levels&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">20</span></a> Differences in IQ may be less significant if blood Phe-concentrations are maintained between 120 and 360 &#956;mol&#47;L &#40;2&#8211;6&#160;mg&#47;dL&#41;&#44; in line with therapeutic goals recommended in PKU treatment&#46;<a class="elsevierStyleCrossRef" href="#bib0002"><span class="elsevierStyleSup">2</span></a></p><p id="para0035" class="elsevierStylePara elsevierViewall">Regarding EF&#44; the present results showed that greater relative Phe-variation was associated with worse results in verbal fluency&#44; visual-spatial working memory&#44; and inhibitory control&#46; Associations between dietary control &#40;i&#46;e&#46; fluctuations in Phe-levels&#41; and EF were reported in previous studies&#46;<a class="elsevierStyleCrossRef" href="#bib0021"><span class="elsevierStyleSup">21</span></a> It is worth mentioning the specific difficulties shown by PKU children in inhibiting motor responses according to task changes&#46; In the BRIEF&#44; caretakers also reported behavioral signs of inhibitory control problems&#44; besides low initiative in social contexts and working memory difficulties&#46; The minor impact of dietary control observed on cognitive flexibility and verbal working memory&#44; as well as discrepancies between verbal and non-verbal working memory&#44; needs to be better understood in future studies&#46;</p><p id="para0036" class="elsevierStylePara elsevierViewall">Regarding SC&#44; the present results suggest that children with PKU also show difficulties in recognizing emotions&#44; but not infer people&#39;s mental states &#40;ToM&#41;&#46; An unexpected result was that metabolic control turned out to be a predictor only for ToM&#46; A possible explanation is that emotional recognition is associated with the overall neurocognitive phenotypic characteristics of PKU and&#44; therefore&#44; less influenced by variations in Phe-levels&#46; Jahja et al&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">5</span></a> identified broader changes in socio-cognitive functioning which were significantly associated with Phe-variations&#44; especially among children over 12 years old&#46; The authors concluded that Phe-control during childhood and early adolescence is important for better social functioning in adulthood&#46; However&#44; they did not differentiate performance in emotion recognition and ToM&#46;</p><p id="para0037" class="elsevierStylePara elsevierViewall">An important issue to discuss is that age was determinant for the performance of children with PKU in all components of EF and CS&#44; although not in IQ&#44; according to previous evidence&#46;<a class="elsevierStyleCrossRefs" href="#bib0005"><span class="elsevierStyleSup">5-11</span></a> It can be hypothesized that&#44; due to the later maturation of the prefrontal cortex&#44; self-regulatory executive skills have contributed to better performance among older participants&#46;</p><p id="para0038" class="elsevierStylePara elsevierViewall">The authors found that with each additional year of age&#44; the variation in plasma Phe-concentration levels dropped by four percentage points&#46; Differently from previous knowledge&#44;<a class="elsevierStyleCrossRef" href="#bib0022"><span class="elsevierStyleSup">22</span></a> the younger the child&#44; the higher the levels of Phe&#44; suggesting a worse treatment adherence related to age&#46; Due to inherent limitations of the sample size and natural Phe-fluctuations during the day&#44; this data should be interpreted with caution&#46; Future research is necessary to explore this controversy due to particular socio-economical and cultural issues in Latin America compared to European and American reports&#46;<a class="elsevierStyleCrossRef" href="#bib0023"><span class="elsevierStyleSup">23</span></a><span class="elsevierStyleSup">&#44;</span><a class="elsevierStyleCrossRef" href="#bib0024"><span class="elsevierStyleSup">24</span></a></p><p id="para0039" class="elsevierStylePara elsevierViewall">The present study has limitations to be mentioned&#46; Because of its cross-sectional design&#44; the determination of individual Phe-fluctuations based on the relative variation of four measures does not necessarily reflect lifelong Phe-control&#46; Additionally&#44; although neuropsychological assessment was integrated into the patient&#39;s follow-up routine&#44; the authors acknowledge that Phe-levels have a natural variation during the day and depend on the time of fasting and type of food ingested&#46; Therefore&#44; conclusions about associations between Phe-fluctuation and neurocognitive development can be limited and demand future studies&#46;</p><p id="para0040" class="elsevierStylePara elsevierViewall">In spite of limitations&#44; the authors believe that the present study innovates by the emphasis done on SC&#44; beyond EF&#44; and associations with metabolic control due to dietary treatment&#46; Furthermore&#44; findings contribute to the literature on PKU&#44; strengthening the important role of dietary control&#44; especially in respect of the development of inhibitory control&#44; visual-spatial working memory&#44; and phonemic verbal fluency&#46; Due to the extended maturation in frontal areas&#44; such functions begin their development in early childhood and are associated with fluid intelligence&#44; which is less influenced by academic learning&#46;</p><p id="para0041" class="elsevierStylePara elsevierViewall">Due to the lack of information on PKU in developing countries&#44; it could be interesting to investigate Brazilian recommended levels of Phe-and practices to compare these data with international recommendations&#46; Greater attention must be paid to the presence of higher Phe-concentrations&#44; as this may be an important early sign of lack of adherence to diet&#44; which may worsen in adolescence&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">25</span></a> Since diet-therapy is the only treatment option that does not seem to be sufficient to preserve neurodevelopment&#44; new therapies have been developed&#44; such as the use of sapropterin dihydrochloride in responsive cases or enzyme replacement therapy with pegvaliase in patients older than 16 years&#46;<a class="elsevierStyleCrossRef" href="#bib0026"><span class="elsevierStyleSup">26</span></a> Advantages of these new therapies include the possibility to increase the amount of food containing Phe-or even in some cases responsive to sapropterin dihydrochloride to skip totally the restricted diet&#44; reaching normal protein diet with recommended Phe-levels improving patient nutrition&#46; The disadvantages&#58; this therapy is not universally successful &#40;less than half of patients are responsive&#41; and seems to work more in milder phenotypes&#59; so some patients need to remain with combined treatment of diet and sapropterin&#44; which increases therapeutic cost&#46;<a class="elsevierStyleCrossRef" href="#bib0027"><span class="elsevierStyleSup">27</span></a> Instead&#44; the enzyme replacement therapy with pegvaliase corrects the biochemical defect with normalization of Phe-levels under unrestricted diet&#44; but allergic reaction&#44; food neophobia and high cost are the disadvantages&#46;<a class="elsevierStyleCrossRef" href="#bib0028"><span class="elsevierStyleSup">28</span></a> There are more options on the horizon coming out such as gene therapy<a class="elsevierStyleCrossRef" href="#bib0029"><span class="elsevierStyleSup">29</span></a> and a new oral drug PTC923 with the promise of being even more effective to more patients&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">30</span></a></p><p id="para0042" class="elsevierStylePara elsevierViewall">This study indicated that children with PKU may present selective impairments in executive functioning and social cognition&#44; regardless of age and IQ&#46; The higher the Phe-levels&#44; the more important the executive function impairment seems to be&#46; The association of neuropsychological screening with consultations for metabolic control can contribute to the early identification of cognitive deficits and the design of interventions in clinical settings&#46;</p></span></span>"
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                  "titulo" => "Intellectual performance"
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                  "titulo" => "Neuropsychological assessment"
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              "titulo" => "Emotional and behavioral assessment"
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    "fechaRecibido" => "2022-11-23"
    "fechaAceptado" => "2023-04-04"
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          "palabras" => array:5 [
            0 => "Phenylketonuria"
            1 => "Diet therapy"
            2 => "Cognition"
            3 => "Executive functions"
            4 => "Theory of mind"
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    "resumen" => array:1 [
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        "titulo" => "Abstract"
        "resumen" => "<span id="abss0001" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0002">Objective</span><p id="spara007" class="elsevierStyleSimplePara elsevierViewall">To investigate the performance of 27 children with phenylketonuria &#40;PKU&#41; in tests of Executive Functions &#40;EF&#41; and Social Cognition &#40;SC&#41;&#44; and their associations with metabolic control inferred by phenylalanine &#40;Phe&#41; levels&#46;</p></span> <span id="abss0002" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0003">Methods</span><p id="spara008" class="elsevierStyleSimplePara elsevierViewall">The PKU group was dichotomized according to baseline Phe-levels into&#59; &#34;classical PKU&#34;&#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;14&#41;&#44; with Phe-levels above 1200 &#956;mol&#47;L &#40;&#62; 20&#160;mg&#47;dL&#41;&#59; and &#34;mild PKU&#34; &#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;13&#41; with Phe-between 360 and 1200 &#956;mol&#47;L &#40;6&#8211;20&#160;mg&#47;dL&#41;&#46; The neuropsychological assessment focused on the EF and SC subtests of the NEPSY-II battery and intellectual performance&#46; Children were compared to age-matched healthy participants&#46;</p></span> <span id="abss0003" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0004">Results</span><p id="spara009" class="elsevierStyleSimplePara elsevierViewall">Participants with PKU presented significantly lower Intellectual Quotient &#40;IQ&#41; compared to controls &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;001&#41;&#46; Regarding EF analysis adjusted by age and IQ&#44; significant differences between groups were observed only in the executive attention subtests &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;029&#41;&#46; The SC set of variables was significantly different between groups &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;003&#41;&#44; as in the affective recognition task &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41;&#46; In the PKU group&#44; the relative variation of Phe-achieved 32&#46;1&#160;&#177;&#160;21&#46;0&#37;&#46; Relative Phe-variation was correlated only with measures of Working Memory &#40;<span class="elsevierStyleItalic">p</span> &#60; 0&#46;001&#41;&#44; Verbal Fluency &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;004&#41;&#44; Inhibitory Control &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;035&#41; and Theory of Mind &#40;<span class="elsevierStyleItalic">p</span>&#160;&#61;&#160;0&#46;003&#41;&#46;</p></span> <span id="abss0004" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cesectitle0005">Conclusions</span><p id="spara010" class="elsevierStyleSimplePara elsevierViewall">Phonological Verbal Fluency&#44; Working Memory&#44; Inhibitory Control&#44; and Theory of Mind were shown to be most vulnerable when there is non-ideal metabolic control&#46; Variations in the level of Phe-may have a selective negative effect on Executive Functions and Social Cognition&#44; but not on intellectual performance&#46;</p></span>"
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            "identificador" => "abss0003"
            "titulo" => "Results"
          ]
          3 => array:2 [
            "identificador" => "abss0004"
            "titulo" => "Conclusions"
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      ]
    ]
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            "etiqueta" => "Appendix"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><a name="en0001"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">Variables&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0002"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">Control &#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;28&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">PKU &#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;27&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0004"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">p <a class="elsevierStyleCrossRef" href="#tb1fn1"><span class="elsevierStyleSup">a</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><a name="en0005"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Mean age &#177; SD &#40;range&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0006"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">9&#46;82&#160;&#177;&#160;2&#46;13&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0007"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">11&#46;1&#160;&#177;&#160;2&#46;98&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0008"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;06&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0009"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Sex&#46; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0010"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0011"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0012"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;69&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0013"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Male&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0014"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">16 &#40;57&#46;1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0015"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">14 &#40;51&#46;9&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0016"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0017"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Female&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0018"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">12 &#40;42&#46;9&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0019"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">13 &#40;48&#46;10&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0020"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0021"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Type of school&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0022"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0023"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0024"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;09&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0025"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Public&#46; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0026"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">24 &#40;85&#46;7&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0027"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">18 &#40;66&#46;7&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0028"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0029"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Private&#46; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0030"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">4 &#40;14&#46;3&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0031"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">9 &#40;33&#46;3&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0032"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0033"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Type of PKU&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0034"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0035"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0036"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0037"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Classical n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0038"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0039"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">14 &#40;51&#46;85&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0040"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0041"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Mild n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0042"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0043"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">13 &#40;48&#46;15&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0044"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0045"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Mean BMI &#40;kg&#47;m<span class="elsevierStyleSup">2</span>&#41; &#177; SD&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0046"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0047"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">19&#46;7&#160;&#177;&#160;3&#46;69&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0048"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0049"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Maternal Education&#46; n &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0050"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0051"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0052"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0053"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Incomplete high school&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0054"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0055"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">2 &#40;7&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0056"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0057"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>High school&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0058"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0059"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">15 &#40;55&#46;6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0060"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0061"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Incomplete undergraduate degree&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0062"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0063"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">2 &#40;7&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0064"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0065"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>Undergraduate degree&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0066"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0067"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">8 &#40;29&#46;6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0068"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><a name="en0069"></a><th class="td-with-role" title="\n
                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t  " align="" valign="top" scope="col">Control&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col">PKU&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top" scope="col">Age&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col">IQ&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0075"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col">Groups<a class="elsevierStyleCrossRef" href="#tb2fn1"><span class="elsevierStyleSup">a</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0076"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0077"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr><tr title="table-row"><a name="en0079"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">&#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;28&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0080"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">&#40;<span class="elsevierStyleItalic">n</span>&#160;&#61;&#160;27&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0081"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">F&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0082"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">p&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0083"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">F&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0084"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">p&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0085"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">F&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><a name="en0086"></a><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">p&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><a name="en0087"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="9" align="left" valign="top"><span class="elsevierStyleBold">Executive Functions</span></td></tr><tr title="table-row"><a name="en0088"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Verbal Fluency&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0089"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0090"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0091"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">27&#46;86&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0092"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0093"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">2&#46;80&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0094"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;07&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0095"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;871&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0096"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;425&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0097"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">FAS&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0098"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">24&#46;2&#160;&#177;&#160;8&#46;46&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0099"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">21&#46;7&#160;&#177;&#160;10&#46;7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0100"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">48&#46;84&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0101"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0102"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">3&#46;36&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0103"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;073&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0104"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">1&#46;77&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0105"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;189&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0106"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Animals&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0107"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">14&#46;7&#160;&#177;&#160;3&#46;14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0108"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">14&#46;4&#160;&#177;&#160;3&#46;14&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0109"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">17&#46;36&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0110"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0111"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">3&#46;5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0112"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;067&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0113"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;089&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0114"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;766&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0115"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Working Memory&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0116"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0114a"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0118"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">22&#46;9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0119"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0120"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">4&#46;74&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0121"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;067&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0122"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;089&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0123"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;766&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0124"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Digit Span&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0125"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">3&#46;79&#160;&#177;&#160;1&#46;23&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0126"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">3&#46;48&#160;&#177;&#160;0&#46;80&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0127"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">24&#46;22&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0128"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0129"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">3&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0130"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;063&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0131"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">1&#46;74&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0132"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;192&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0133"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Corsi&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0134"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">6&#46;14&#160;&#177;&#160;1&#46;96&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0135"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">6&#46;11&#160;&#177;&#160;2&#46;55&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0136"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">20&#46;54&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0137"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0138"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">5&#46;66&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0139"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;021&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0140"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;47&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0141"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;494&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0142"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Executive Attention&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0143"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0114c"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0145"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">4&#46;41&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0146"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;017&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0147"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">1&#46;39&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0148"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;26&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0149"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">2&#46;56&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0150"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;09&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0151"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">AA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0152"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">30&#46;0&#160;&#177;&#160;0&#46;6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0153"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">29&#46;3&#160;&#177;&#160;1&#46;79&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0154"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">6&#46;042&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0155"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;017&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0156"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;06&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0157"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;807&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0158"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">1&#46;23&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0159"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;272&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0160"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">RS&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0161"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">34&#46;1&#160;&#177;&#160;3&#46;56&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0162"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">31&#46;3&#160;&#177;&#160;6&#46;02&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0163"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">6&#46;241&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0164"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;016&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0165"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;06&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0166"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;807&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0167"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">5&#46;065&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0168"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;029&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0169"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="9" align="left" valign="top"><span class="elsevierStyleBold">Cognitive Flexibility</span><a class="elsevierStyleCrossRef" href="#tb2fn2"><span class="elsevierStyleSup">b</span></a></td></tr><tr title="table-row"><a name="en0170"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">AS&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0171"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">4&#46;07&#160;&#177;&#160;1&#46;88&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0172"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">4&#46;11&#160;&#177;&#160;1&#46;80&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0173"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0174"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;002&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0175"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0176"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;012&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0177"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">&#8211;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Inhibitory Control&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">24&#46;85&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">5&#46;2&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;003&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;613&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;61&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0188"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">IN<span class="elsevierStyleGlyphsbnd"></span>N Naming&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0189"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;04&#160;&#177;&#160;0&#46;19&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">2&#46;44&#160;&#177;&#160;4&#46;88&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">2&#46;023&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">1&#46;3&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">IN-I Inhibition&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0198"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;04&#160;&#177;&#160;0&#46;27&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">1&#46;04&#160;&#177;&#160;0&#46;298&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">57&#46;52&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0202"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">5&#46;28&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;01&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;92&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0206"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">IN-S Switching&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0207"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;65&#160;&#177;&#160;0&#46;19&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0208"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">0&#46;61&#160;&#177;&#160;0&#46;186&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0209"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">32&#46;31&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0210"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">12&#46;13&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0212"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t ; entry_with_role_colgroup " colspan="9" align="left" valign="top"><span class="elsevierStyleBold">Social Cognition</span></td></tr><tr title="table-row"><a name="en0216"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">Social Cognition&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td><a name="en0224"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;003&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">ToM&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0226"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="" valign="top">22&#46;9&#160;&#177;&#160;2&#46;82&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">13&#46;29&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0234"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">AR&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0235"></a><td class="td" title="\n
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                  \t\t\t\t</td><a name="en0236"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">11&#46;76&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0238"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;03&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0240"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">&#60;0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">B &#40;IC 95&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td><a name="en0249"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">Verbal&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0253"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;006 &#40;&#8722;0&#46;249 a 0&#46;237&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0254"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;96&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0255"></a><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;205&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0258"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="3" align="left" valign="top"><span class="elsevierStyleBold">Executive Functions</span></td></tr><tr title="table-row"><a name="en0259"></a><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0262"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">FAS&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;004&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Animals&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0266"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;108 &#40;&#8722;0&#46;185 a &#8722;0&#46;030&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0267"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;008&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t ; entry_with_role_colgroup " colspan="3" align="left" valign="top"><span class="elsevierStyleBold">Working Memory</span></td></tr><tr title="table-row"><a name="en0269"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">Digit Span&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0270"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;0159 &#40;&#8722;0&#46;034 a 0&#46;0026&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0271"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;09&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Corsi&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;0281 &#40;&#8722;0&#46;044 a 0&#46;012&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0274"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">&#60; 0&#46;001&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0275"></a><td class="td-with-role" title="\n
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                  \t\t\t\t ; entry_with_role_colgroup " colspan="3" align="left" valign="top"><span class="elsevierStyleBold">Executive Attention</span></td></tr><tr title="table-row"><a name="en0276"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">AA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0277"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;022 &#40;&#8722;0&#46;056 a 0&#46;011&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0278"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;187&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0279"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">RS&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0280"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;102 &#40;&#8722;0&#46;213 a 0&#46;008&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0281"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;069&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0282"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="3" align="left" valign="top"><span class="elsevierStyleBold">Cognitive Flexibility</span></td></tr><tr title="table-row"><a name="en0283"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">AS&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0284"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;002&#40;&#8722;0&#46;037 a 0&#46;033&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0285"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;892&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0286"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="3" align="left" valign="top"><span class="elsevierStyleBold">Inhibition</span></td></tr><tr title="table-row"><a name="en0287"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">IN-N Naming&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0288"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;037 &#40;&#8722;0&#46;132 a 0&#46;057&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0289"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;422&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0290"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">IN-I Inhibition&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0291"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;005 &#40;&#8722;0&#46;011 a &#8722;4&#46;35e-4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0292"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;035&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0293"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">IN-S Switching&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0294"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;002 &#40;&#8722;0&#46;005 a 0&#46;001&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0295"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;194&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0296"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="3" align="left" valign="top">Social Cognition</td></tr><tr title="table-row"><a name="en0297"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">ToM&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0298"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;075 &#40;&#8722;0&#46;121 a &#8722;0&#46;028&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0299"></a><td class="td" title="\n
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                  \t\t\t\t  " align="char" valign="top">0&#46;003&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0300"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top"><span class="elsevierStyleHsp" style=""></span>AS&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0301"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">&#8722;0&#46;048 &#40;&#8722;0&#46;123 a 0&#46;025&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0302"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="top">0&#46;186&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">Exp&#40;B&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">IC 95&#37;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="" valign="top" scope="col" style="border-bottom: 2px solid black">p <a class="elsevierStyleCrossRef" href="#tb4fn1"><span class="elsevierStyleSup">a</span></a>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><a name="en0307"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="4" align="left" valign="top"><span class="elsevierStyleBold">CBCL</span></td></tr><tr title="table-row"><a name="en0308"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Internalizing&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0309"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;017&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0310"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;999 a 1&#46;06&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0311"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;33&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0312"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Externalizing&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0313"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;982&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0314"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;9209 a 1&#46;031&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0315"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;521&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0316"></a><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_colgroup " colspan="4" align="left" valign="top"><span class="elsevierStyleBold">BRIEF</span></td></tr><tr title="table-row"><a name="en0317"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Inhibit&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0318"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;085&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0319"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;01 a 1&#46;20&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0320"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;04&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0321"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Shift&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0322"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;02&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0323"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;984 a 1&#46;07&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0324"></a><td class="td" title="\n
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                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0325"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">Emotional Control&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">1&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">0&#46;925 a 1&#46;07&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0328"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">0&#46;86&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><a name="en0329"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="" valign="top">1&#46;04&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Initiate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Working Memory&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0338"></a><td class="td" title="\n
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                  \t\t\t\t  " align="" valign="top">1&#46;064&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Plan&#47;Organize &#62;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0342"></a><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;035&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">1&#46;015&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">0&#46;72&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">Monitor&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="" valign="top">1&#46;035&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">0&#46;26&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">1&#46;031&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="" valign="top">1&#46;054&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><a name="en0359"></a><td class="td" title="\n
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                  \t\t\t\t</td><a name="en0360"></a><td class="td" title="\n
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Vol. 99. Issue 5.
Pages 507-513 (September - October 2023)
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Vol. 99. Issue 5.
Pages 507-513 (September - October 2023)
Original article
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Influence of blood phenylalanine level variations on the development of executive functions and social cognition in children with phenylketonuria
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Cristiane Mendes de Almeida Duartea, Flavia Balbo Piazzonb,c, Isadora Salvador Roccod,
Corresponding author
isadora.rocco@unifesp.br

Corresponding author.
, Claudia Berlim de Melloa
a Universidade Federal de São Paulo (UNIFESP), Departamento de Psicobiologia, São Paulo, SP, Brazil
b University Hospital Liège & University of Liège, Department of Pediatrics, Neuromuscular Reference Center, Liège, Belgium
c Universidade de São Paulo (USP), Unidade Neurometabólica, São Paulo, SP, Brazil
d Universidade Federal de São Paulo (UNIFESP), Programa de Pós-Graduação em Cardiologia e Departamento de Cirurgia Cardíaca, São Paulo, SP, Brazil
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Tables (4)
Table 1. Sociodemographic, anthropometric and clinical characteristics.
Table 2. Comparison between groups covariated for age and IQ on EF and CS.
Table 3. Influence of Phe-variation on observed outcomes.
Table 4. Phe-variation as a determinant for CBCL and BRIEF scales.b
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Additional material (1)
Abstract
Objective

To investigate the performance of 27 children with phenylketonuria (PKU) in tests of Executive Functions (EF) and Social Cognition (SC), and their associations with metabolic control inferred by phenylalanine (Phe) levels.

Methods

The PKU group was dichotomized according to baseline Phe-levels into; "classical PKU"(n = 14), with Phe-levels above 1200 μmol/L (> 20 mg/dL); and "mild PKU" (n = 13) with Phe-between 360 and 1200 μmol/L (6–20 mg/dL). The neuropsychological assessment focused on the EF and SC subtests of the NEPSY-II battery and intellectual performance. Children were compared to age-matched healthy participants.

Results

Participants with PKU presented significantly lower Intellectual Quotient (IQ) compared to controls (p = 0.001). Regarding EF analysis adjusted by age and IQ, significant differences between groups were observed only in the executive attention subtests (p = 0.029). The SC set of variables was significantly different between groups (p = 0.003), as in the affective recognition task (p < 0.001). In the PKU group, the relative variation of Phe-achieved 32.1 ± 21.0%. Relative Phe-variation was correlated only with measures of Working Memory (p < 0.001), Verbal Fluency (p = 0.004), Inhibitory Control (p = 0.035) and Theory of Mind (p = 0.003).

Conclusions

Phonological Verbal Fluency, Working Memory, Inhibitory Control, and Theory of Mind were shown to be most vulnerable when there is non-ideal metabolic control. Variations in the level of Phe-may have a selective negative effect on Executive Functions and Social Cognition, but not on intellectual performance.

Keywords:
Phenylketonuria
Diet therapy
Cognition
Executive functions
Theory of mind
Full Text
Introduction

Phenylketonuria (PKU) is an autosomal recessive disorder caused by phenylalanine hydroxylase (PAH) gene mutations,1 causing partial or total deficiency of the PAH enzyme, which converts phenylalanine (Phe) into tyrosine (Tyr). The accumulation of Phe-results in tissue toxicity, especially in the central nervous system.2 The clinical phenotypes are usually classified as classical PKU, characterized by plasmatic Phe-levels above 1200 μmol/L defined by tandem mass spectrometry (20 mg/dL by fluorometric immunoassay); and mild PKU, when Phe-levels remain between 360 and 1200 μmol/L (6–20 mg/dL).2 According to European guidelines,3 patients with levels above 360 μmol/L (6 mg/dL) should be treated to achieve a therapeutic goal of Phe-between 120 and 360 μmol/L (2–6 mg/dL).1,2 At the time of this study, the treatment for newborns adopted by Brazilian institutions is recommended only for cases with levels above 10 mg/dL or 600 μmol/L.4

To ensure a better prognosis, children with PKU must be submitted to a low-protein diet to control plasmatic Phe-levels as early as possible.2 The time from birth to 12 years of age is a crucial period to maintain stable Phe-levels to preserve neurodevelopment.3 Moreover, diet therapy should be lifelong, since variations in Phe-may result in neurological damage, leading to intellectual deficiency, hyperactivity, and deficits in Executive Functions (EF) and Social Cognition (SC)2,5. EF skills enable individuals to engage in goal-directed activities and SC is important to regulate behavior through understanding other people's intentions or feelings.6 There is evidence that an increase of 100 μmol/L in Phe-level predicts a decrease of 1.3 to 6 points in intelligence quotient (IQ).3,7 Therefore, dietary adherence is important to provide metabolic stability and guarantee cognitive development.2,3

Although nutritional treatment has been shown to improve cognitive and behavioral outcomes, neuropsychological dysfunctions have been reported even in individuals submitted to early intervention. The SC and EF domains seem particularly vulnerable to long-term variations of Phe-levels.2 Inhibitory control8, working memory9, cognitive flexibility10 and verbal fluency11 impairments are usual and prevail in children with delayed diagnosis without intellectual impairment.12 Therefore, the extent of the effects of fluctuations in, and high concentrations of, Phe-on neurodevelopment must be better understood.

This study was designed to analyze the effects of individual variability in Phe-levels on cognitive outcomes in Brazilian PKU children. The authors hypothesized that poor metabolic control, demonstrated by elevated mean Phe-levels in follow-up, would be associated with worse cognitive outcomes. Therefore, the authors aimed to 1) compare intellectual, EF and SC performance of PKU and typically developing children; 2) investigate associations between performance and Phe-fluctuations in the PKU group. Results may provide insights into the PKU neurocognitive phenotype that could be useful for clinical approaches. The interest in FE and CS skills was due to their associations with psychosocial outcomes, such as school performance and peer interaction in the short and mid-terms, and on quality of life in the long term.

Methods

This cross-sectional exploratory study undertook a quantitative analysis of the neuropsychological performance of children with PKU compared with age-matched healthy controls, approved by the local Ethics Committee (UNIFESP/protocol 2.879.610). All legal guardians provided informed consent and children provided assent for participation.

Participants

Twenty-seven children of both sexes diagnosed with Phenylketonuria (PKU group) and 28 children with neurotypical development (control group) aged between 7 and 15 years participated in the study. Children with PKU were recruited from those in clinical follow-up at Instituto Jô Clemente (IJC), a referral center for newborn screening. Control participants were recruited from public and private schools.

The PKU group was dichotomized according to baseline Phe-levels (i.e. before diet therapy) into "classical PKU" (n = 14), with levels above 1200 μmol/L (> 20 mg/dL); and "mild PKU" (n = 13) with levels between 360 and 1200 μmol/L (6–20 mg/dL). Exclusion criteria for the PKU group were lack of regular diet therapy and attendance at follow-up; for controls were reports of learning disabilities, and neurological or psychiatric disorders.

All PKU participants presented Phe-levels above 4 mg/dL until the 15th day of life. They were diagnosed in basic health units or maternity hospitals between the 3rd-5th day of life. Soon after diagnosis, children were referred for clinical follow-up with a multidisciplinary team. After a new assessment of Phe-levels to confirm PKU, nutritional management of Phe-ingestion comprising diet therapy and regular monitoring of levels was started. The frequency of return visits varies according to age: a) weekly for children between 0 and 6 months of age; b) fortnightly for 6–12 months; c) monthly for 1–2 years; d) quarterly for those over 2 years old. Follow-up includes psychological evaluations to monitor neurocognitive development.

Clinical characteristics

Clinical (PKU phenotype, Phe-levels), socio-demographic (age, sex, maternal education), and anthropometric (body mass index) variables of PKU participants were collected from medical records. Phe-levels were obtained by fluorometric method following Brazilian guidelines4 and performed by an expert. All met the necessary requirement to minimize the Phe-fluctuation as much as possible in the follow-up sampling: blood collection always at the same time in the morning; a 3-hour fasting period before the measurement of Phe, and the child's last meal before testing consisted of a Phe-source food, with the amount of amino acid prescribed by the dietician. The examination is part of the follow-up routine to monitor Phe-levels.

Four measures of the Phe-levels of each participant were considered. The first was collected after birth and defined the PKU phenotype. The classical PKU phenotype presented mean Phe-levels of 31.2 ± 10.5 mg/dL and the mild PKU had a mean of 15.1 ± 3.81 mg/dL. The other measures comprised the last three blood samples obtained before inclusion in the study. Individual fluctuations in Phe-levels were defined as a percentage variation from the last blood sample, i.e. relative variation (%variation Phe = SD*100 = X/M). The study member that executed the neuropsychological assessment was blinded to the PKU phenotype and to historical Phe-levels.

Neuropsychological investigation

The neuropsychological assessment included intellectual, EF and SC measures. For PKU children it was combined with regular clinical visits and performed individually in appropriate rooms at IJC. Controls were assessed in noise-controlled rooms at their schools, without prejudice to routine activities.

Intellectual performance

The validated Wechsler Abbreviated Scale of Intelligence (WASI)13 was used to assess intellectual performance. The WASI provides three main index scores: full intelligence quotient (IQ), verbal (VIQ), and performance IQ (PIQ).

Neuropsychological assessment

The developmental neuropsychological battery NEPSY-II adapted to Portuguese was used to investigate EF and SC.14 The battery covers ages 3–16 years and is widely used in studies with neurodevelopmental disorders. Reports with clinical samples in the manual indicate high-reliability coefficients (rs = 0.85–0.87). Raw scores were used for analyses.

The subtests of the Attention and Executive Functions domain were used: Animal Sorting (AS; assesses cognitive flexibility); Auditory Attention (AA; selective attention); Response Set (RS; auditory attention and vigilance); and Inhibition (IN; inhibitory control and shifting). The protocol also included the digit span and Corsi block-tapping tests of working memory.15 Scores were the extent of digits (maximum 8) or cubes (maximum 7) repeated backward. The number of animals starting with given letters (F,A,S) generated in 60 s was the measures of semantic and verbal fluency, respectively.15

The validated Behavior Rating Inventory of Executive Functions (BRIEF) completed the EF assessment.16 The main caretaker answered 86 questions about behaviors observed at home as "never", "sometimes", and "often". A threshold above 65 indicates a clinical profile.

Social Cognition (SC) was assessed using the subtests of Affect Recognition (AR) and Theory of Mind (ToM). The AR assesses children's ability to identify basic emotions in faces. The ToM assesses abilities to interpret beliefs, intentions, thoughts, and emotions from another person's perspective, among others.

Emotional and behavioral assessment

The Child Behavior Checklist – CBCL adapted for Brazilian children17 answered by caretakers was used for behavioral assessment. It comprises 113 questions about everyday behavior with responses being "not true", "sometimes/somewhat true" and "very often true", proving quantitative indices related to internalizing (somatic problems, anxiety, depression) and externalizing (rule-breaking behavior, aggressive behavior) profiles. A t-score > 65 indicates a clinically meaningful threshold.

Statistical analysis

Statistical analysis was performed using the JAMOVI software (version 2.3.22). Descriptive statistics presented categorical data as absolute and relative frequencies, and numerical data as mean ± standard deviation, median, and confidence intervals when applicable. Generalized Linear Models (GzLM) were used to investigate differences in IQ between groups and identify the impact of variations among Phe-levels on dependent variables. Multivariate analysis of covariance (MANCOVA) was used to identify the effects of groups in a set of dependent variables adjusted by age and IQ. Finally, univariate, and multivariate linear regression analyses were performed to identify the clinical variables with the greatest impact on discrimination between groups. The level of significance adopted was p < 0.05.

Results

Clinical characteristics were similar in both groups, although the control group had more patients below 10 years of age (Table 1). Therefore, age was added as a covariate to avoid any confounding results. Since no significant difference was observed in IQ between the classical and mild phenotypes (p = 0.415), the PKU patients were not dichotomized into subgroups for the comparative analysis with the control group.

Table 1.

Sociodemographic, anthropometric and clinical characteristics.

Variables  Control (n = 28)  PKU (n = 27)  p a 
Mean age ± SD (range)  9.82 ± 2.13  11.1 ± 2.98  0.06 
Sex. n (%)  –  –  0.69 
Male  16 (57.1)  14 (51.9)  – 
Female  12 (42.9)  13 (48.10)  – 
Type of school  –  –  0.09 
Public. n (%)  24 (85.7)  18 (66.7)  – 
Private. n (%)  4 (14.3)  9 (33.3)  – 
Type of PKU  –  –  – 
Classical n (%)  –  14 (51.85)  – 
Mild n (%)  –  13 (48.15)  – 
Mean BMI (kg/m2) ± SD  –  19.7 ± 3.69  – 
Maternal Education. n (%)  –  –  – 
Incomplete high school  –  2 (7.4)  – 
High school  –  15 (55.6)  – 
Incomplete undergraduate degree  –  2 (7.4)  – 
Undergraduate degree  –  8 (29.6)  – 
a

Generalized Linear Models (GzLM).

Participants with PKU presented significantly lower IQ scores compared to controls (89.8 ± 10.8 versus 109.0 ± 9.5, p = 0.001, respectively), with both VIQ (p < 0.001) and PIQ (p < 0.001) different among groups. Thus, IQ was also treated as a covariate in the MANCOVA for EF and SC. The aim was to understand whether the EF and SC performance would be more explained by intelligence level rather than PKU presence.

In the EF analysis adjusted by age and IQ, significant differences between the control and PKU groups were observed only in the set of executive attention subtests (RS) of NEPSY-II (p = 0.029). The authors found significant associations of age with the following EF tasks: executive attention (p = 0.017); verbal fluency (p = 0.001), phonemic fluency (p ≤ 0.001), and semantic verbal fluency tasks (p < 0.001); working memory (p = 0.001); cognitive flexibility (p < 0.0021); and inhibitory control (p < 0.001). Yet, IQ was only associated with working memory (p = 0.013), cognitive flexibility (p = 0.012), and inhibitory control (p = 0.003) outcomes.

The SC set of variables (Table 2) was significantly different between groups (p = 0.003), adjusted by age and IQ. Groups differed significantly in the affective recognition (AR) task (p < 0.001), but not in ToM (p = 0.345). Age was associated with the overall SC scores (p = 0.001) and with both AR (p = 0.001) and ToM (p = 0.001) tasks. No significant associations were observed between IQ and the SC set of variables (p = 0.955).

Table 2.

Comparison between groups covariated for age and IQ on EF and CS.

VariablesControl  PKU    Age  IQ  Groupsa     
(n = 28)  (n = 27) 
Executive Functions
Verbal Fluency      27.86  <0.001  2.80  0.07  0.871  0.425 
FAS  24.2 ± 8.46  21.7 ± 10.7  48.84  <0.001  3.36  0.073  1.77  0.189 
Animals  14.7 ± 3.14  14.4 ± 3.14  17.36  <0.001  3.5  0.067  0.089  0.766 
Working Memory      22.9  <0.001  4.74  0.067  0.089  0.766 
Digit Span  3.79 ± 1.23  3.48 ± 0.80  24.22  <0.001  3.6  0.063  1.74  0.192 
Corsi  6.14 ± 1.96  6.11 ± 2.55  20.54  <0.001  5.66  0.021  0.47  0.494 
Executive Attention      4.41  0.017  1.39  0.26  2.56  0.09 
AA  30.0 ± 0.6  29.3 ± 1.79  6.042  0.017  0.06  0.807  1.23  0.272 
RS  34.1 ± 3.56  31.3 ± 6.02  6.241  0.016  0.06  0.807  5.065  0.029 
Cognitive Flexibilityb
AS  4.07 ± 1.88  4.11 ± 1.80  –  <0.002  –  0.012  –  0.235 
Inhibitory Control      24.85  <0.001  5.2  0.003  0.613  0.61 
INN Naming  1.04 ± 0.19  2.44 ± 4.88  2.023  0.161  1.3  0.259  0.885  0.351 
IN-I Inhibition  1.04 ± 0.27  1.04 ± 0.298  57.52  <0.001  5.28  0.026  0.01  0.92 
IN-S Switching  0.65 ± 0.19  0.61 ± 0.186  32.31  <0.001  12.13  <0.001  0.955  0.333 
Social Cognition
Social Cognition      11.57  <0.001  0.04  0.95  6.35  0.003 
ToM  23.7 ± 4.38  22.9 ± 2.82  13.29  <0.001  0.05  0.82  0.907  0.345 
AR  29.8 ± 2.29  27.0 ± 3.91  11.76  0.001  0.03  0.84  12.41  <0.001 

Generalized Linear Models (GzLM).

a

Analysis covariate by age and IQ.

b

Multivariate analysis of covariance (MANCOVA).

In the PKU group, the mean time variation among the collection of the three blood samples was 4.07 ± 1.67 months, maintaining stable fluctuations (p = 0.225). The Phe-levels were 7.56 ± 3.10 mg/dL at the first collection, 7.49 ± 3.59 mg/dL at the second, and 7.76 ± 3.90 mg/dL at the last. Individual mean variations of Phe-levels were 2.21 ± 1.50 mg/dL, which corresponded to a variation of 32.1 ± 21.0% between collections. To ensure the detection of relative oscillations in Phe-levels in PKU patients, the percentage change between the three time periods was used to define individual variation.

Relative Phe-variation was not correlated with total IQ (p = 0.32, Table 3), or with verbal (p = 0.96) or performance (p = 0.205) quotients. Among EF tests, relative Phe-variation was significantly correlated only with Corsi task scores and working memory index (p = 0.001). Relative Phe-variation was associated with phonemic verbal fluency scores (p = 0.004) and inhibitory control index (p = 0.035). Considering SC variables, it was associated with ToM test scores (p = 0.003).

Table 3.

Influence of Phe-variation on observed outcomes.

VariablesPhe-variation
B (IC 95%) 
IQ  −0.102 (−0.310 a 0.106)  0.32 
Intelligence
Verbal  −0.006 (−0.249 a 0.237)  0.96 
Execution  −0.152 (−0.393 a 0.0888)  0.205 
Executive Functions
Verbal Fluency     
FAS  −0.274 (−0.450 a −0.0974)  0.004 
Animals  −0.108 (−0.185 a −0.030)  0.008 
Working Memory
Digit Span  −0.0159 (−0.034 a 0.0026)  0.09 
Corsi  −0.0281 (−0.044 a 0.012)  < 0.001 
Executive Attention
AA  −0.022 (−0.056 a 0.011)  0.187 
RS  −0.102 (−0.213 a 0.008)  0.069 
Cognitive Flexibility
AS  −0.002(−0.037 a 0.033)  0.892 
Inhibition
IN-N Naming  −0.037 (−0.132 a 0.057)  0.422 
IN-I Inhibition  −0.005 (−0.011 a −4.35e-4)  0.035 
IN-S Switching  −0.002 (−0.005 a 0.001)  0.194 
Social Cognition
ToM  −0.075 (−0.121 a −0.028)  0.003 
AS  −0.048 (−0.123 a 0.025)  0.186 

Generalized Linear Models (GzLM).

Finally, the authors investigated whether the percentage change in Phe-would be a determinant for behavioral problems and EF, as reported by the main caretakers. Relative Phe-variation was not correlated with CBCL scores related to internalizing profile (p = 0.33) nor to externalizing profile (p = 0.52). In the BRIEF, relative Phe-variation was associated with inhibition (p = 0.04), initiative (p = 0.05) and working memory (p = 0.04) scores, and overall executive functioning index (p = 0.05, Table 4).

Table 4.

Phe-variation as a determinant for CBCL and BRIEF scales.b

Variables  Exp(B)  IC 95%  p a 
CBCL
Internalizing  1.017  0.999 a 1.06  0.33 
Externalizing  0.982  0.9209 a 1.031  0.521 
BRIEF
Inhibit  1.085  1.01 a 1.20  0.04 
Shift  1.02  0.984 a 1.07  0.21 
Emotional Control  0.925 a 1.07  0.86 
Behavioral Regulation  1.04  0.99 a 1.013  0.11 
Initiate  1.063  1.006 a 1.150  0.05 
Working Memory  1.064  1.010 a 1.152  0.04 
Plan/Organize >  1.035  0.097 a 1.106  0.26 
Organization of materials  1.015  0.906 a 1.105  0.72 
Monitor  1.035  0.970 a 1.106  0.26 
Metacognition  1.031  0.976 a 1.091  0.24 
Global Executive Composite  1.054  1.003 a 1.129  0.05 
a

Logistic Regression.

b

To analyze the results of Phe-variation as a determinant for the CBCL and BRIEF scales. Only patients in the clinical group who obtained a score above > 65 points were considered.

The authors also investigated which anthropometric and sociodemographic variables might be predictors of Phe-variation. The authors considered the following variables: age, sex, body mass index (BMI), maternal educational level, type of PKU, and the concentration of blood Phe-present in the first clinical examination.

In the first analysis (Table S1), the authors assessed the association of each variable separately (univariate). The authors considered the variables presenting p < 0.15 to compose the multivariate analysis and determine potential predictors. The authors identified age (p = 0.001) and BMI (p = 0.112) as possible predictors of Phe-variations. However, multivariate analysis showed that only age was an independent predictor for Phe-variations (p = 0.002).

Discussion

This study investigated EF and SC in a sample of children with classic and mild PKU undergoing diet therapy. Results suggest that poor metabolic control, demonstrated by uncontrolled Phe-levels, has a selective negative effect on cognitive domains, but not on intellectual performance. Phonemic verbal fluency, visuospatial working memory, EF and ToM skills were shown to be the most susceptible to worse metabolic control. There was no evidence of associations with internalizing or externalizing behavioral problems.

An initial topic of discussion concerns the association between metabolic control and intelligence. Children with PKU showed significantly lower IQ scores compared to controls, even in average ranges. These findings are similar to Gassió et al.18 results with a similar number of participants (n = 37) and mean Phe-values (444 ± 145μmol/L; i.e. 7.33 ± 2.39 mg/dL), revealing IQs levels (100 ± 11.0) lower than controls (p = 0.001).

In the present study, Phe-variations did not predict IQ, which differs from previous findings as described by Hood et al.19 in a sample of 47 children followed from birth to 10 years of age, where variations in Phe-levels were negatively correlated with IQs, although IQ was still average. Such results may be explained by the greater variability of Phe-in their sample (202.4 ± 84.4μmol; 3.34 ± 1.39 mg/dL). Conversely, lower IQs have been associated with plasma concentration values obtained at the time of assessment and not with fluctuations in levels.20 Differences in IQ may be less significant if blood Phe-concentrations are maintained between 120 and 360 μmol/L (2–6 mg/dL), in line with therapeutic goals recommended in PKU treatment.2

Regarding EF, the present results showed that greater relative Phe-variation was associated with worse results in verbal fluency, visual-spatial working memory, and inhibitory control. Associations between dietary control (i.e. fluctuations in Phe-levels) and EF were reported in previous studies.21 It is worth mentioning the specific difficulties shown by PKU children in inhibiting motor responses according to task changes. In the BRIEF, caretakers also reported behavioral signs of inhibitory control problems, besides low initiative in social contexts and working memory difficulties. The minor impact of dietary control observed on cognitive flexibility and verbal working memory, as well as discrepancies between verbal and non-verbal working memory, needs to be better understood in future studies.

Regarding SC, the present results suggest that children with PKU also show difficulties in recognizing emotions, but not infer people's mental states (ToM). An unexpected result was that metabolic control turned out to be a predictor only for ToM. A possible explanation is that emotional recognition is associated with the overall neurocognitive phenotypic characteristics of PKU and, therefore, less influenced by variations in Phe-levels. Jahja et al.5 identified broader changes in socio-cognitive functioning which were significantly associated with Phe-variations, especially among children over 12 years old. The authors concluded that Phe-control during childhood and early adolescence is important for better social functioning in adulthood. However, they did not differentiate performance in emotion recognition and ToM.

An important issue to discuss is that age was determinant for the performance of children with PKU in all components of EF and CS, although not in IQ, according to previous evidence.5-11 It can be hypothesized that, due to the later maturation of the prefrontal cortex, self-regulatory executive skills have contributed to better performance among older participants.

The authors found that with each additional year of age, the variation in plasma Phe-concentration levels dropped by four percentage points. Differently from previous knowledge,22 the younger the child, the higher the levels of Phe, suggesting a worse treatment adherence related to age. Due to inherent limitations of the sample size and natural Phe-fluctuations during the day, this data should be interpreted with caution. Future research is necessary to explore this controversy due to particular socio-economical and cultural issues in Latin America compared to European and American reports.23,24

The present study has limitations to be mentioned. Because of its cross-sectional design, the determination of individual Phe-fluctuations based on the relative variation of four measures does not necessarily reflect lifelong Phe-control. Additionally, although neuropsychological assessment was integrated into the patient's follow-up routine, the authors acknowledge that Phe-levels have a natural variation during the day and depend on the time of fasting and type of food ingested. Therefore, conclusions about associations between Phe-fluctuation and neurocognitive development can be limited and demand future studies.

In spite of limitations, the authors believe that the present study innovates by the emphasis done on SC, beyond EF, and associations with metabolic control due to dietary treatment. Furthermore, findings contribute to the literature on PKU, strengthening the important role of dietary control, especially in respect of the development of inhibitory control, visual-spatial working memory, and phonemic verbal fluency. Due to the extended maturation in frontal areas, such functions begin their development in early childhood and are associated with fluid intelligence, which is less influenced by academic learning.

Due to the lack of information on PKU in developing countries, it could be interesting to investigate Brazilian recommended levels of Phe-and practices to compare these data with international recommendations. Greater attention must be paid to the presence of higher Phe-concentrations, as this may be an important early sign of lack of adherence to diet, which may worsen in adolescence.25 Since diet-therapy is the only treatment option that does not seem to be sufficient to preserve neurodevelopment, new therapies have been developed, such as the use of sapropterin dihydrochloride in responsive cases or enzyme replacement therapy with pegvaliase in patients older than 16 years.26 Advantages of these new therapies include the possibility to increase the amount of food containing Phe-or even in some cases responsive to sapropterin dihydrochloride to skip totally the restricted diet, reaching normal protein diet with recommended Phe-levels improving patient nutrition. The disadvantages: this therapy is not universally successful (less than half of patients are responsive) and seems to work more in milder phenotypes; so some patients need to remain with combined treatment of diet and sapropterin, which increases therapeutic cost.27 Instead, the enzyme replacement therapy with pegvaliase corrects the biochemical defect with normalization of Phe-levels under unrestricted diet, but allergic reaction, food neophobia and high cost are the disadvantages.28 There are more options on the horizon coming out such as gene therapy29 and a new oral drug PTC923 with the promise of being even more effective to more patients.30

This study indicated that children with PKU may present selective impairments in executive functioning and social cognition, regardless of age and IQ. The higher the Phe-levels, the more important the executive function impairment seems to be. The association of neuropsychological screening with consultations for metabolic control can contribute to the early identification of cognitive deficits and the design of interventions in clinical settings.

Acknowledgments

The authors thank the Associação Fundo de Incentivo à Pesquisa (AFIP) and Instituto Jô Clemente

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