Fernando de Noronha Island, because of its ecological characteristics, has virtually no atmospherical pollution that could cause asthma. Nevertheless, asthma prevalence in children younger than 6 years old is 11.22%. 17 asthmatic children and 68 healthy ones were included in this case control study (1:4 case/controls) conducted in a closed community free from atmosphere pollution. Maternal asthma and exposure to smoking were more frequently associated with asthmatic children than with controls, the risc of asthmatic syndrome being respectively 6.9 and 4.6 times bigger. As for breastfeeding no protective effect was found in both cases and controls.
The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years.
© Clarivate Analytics, Journal Citation Reports 2022
SRJ is a prestige metric based on the idea that not all citations are the same. SJR uses a similar algorithm as the Google page rank; it provides a quantitative and qualitative measure of the journal's impact.
See moreSNIP measures contextual citation impact by wighting citations based on the total number of citations in a subject field.
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