Abstract：
BACKGROUND AND OBJECTIVE:Genetic and environmental factors have been recognized to play an important role in autism. The possibility that exposure to outdoor air pollution increases the risk of autism spectrum disorder (ASD) has been an emerging area of research. Herein, we present a systematic review, and meta-analysis of published epidemiological studies that have investigated these associations. METHODS:We undertook a comprehensive search strategy to identify studies that investigated outdoor air pollution and autism in children. Overall, seven cohorts and five case-control studies met our inclusion criteria for the meta-analysis. We summarized the associations between exposure to air pollution and ASD based on the following critical exposure windows: (i) first, second and third trimester of pregnancy, (ii) entire pregnancy, and (iii) postnatal period. Random effects meta-analysis modeling was undertaken to derive pooled risk estimates for these exposures across the studies. RESULTS:The meta-estimates for the change in ASD associated with a 10μg/m3 increase in exposure in PM2.5 and 10 ppb increase in NO2 during pregnancy were 1.34 (95% CI:0.83, 2.17) and 1.05 (95% CI:0.99, 1.11), respectively. Stronger associations were observed for exposures received after birth, but these estimates were unstable as they were based on only two studies. O3 exposure was weakly associated with ASD during the third trimester of pregnancy and during the entire pregnancy, however, these estimates were also based on only two studies. CONCLUSION:Our meta-analysis support the hypothesis that exposure to ambient air pollution is associated with an increased risk of autism. Our findings should be interpreted cautiously due to relatively small number of studies, and several studies were unable to control for other key risk factors.
journal_name
Environ Resjournal_title
Environmental researchauthors
Flores-Pajot MC,Ofner M,Do MT,Lavigne E,Villeneuve PJdoi
10.1016/j.envres.2016.07.030subject
Has Abstractpub_date
2016-11-01 00:00:00pages
763-776eissn
0013-9351issn
1096-0953pii
S0013-9351(16)30317-6journal_volume
151pub_type
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