Air Pollution during Pregnancy and Childhood Autism Spectrum Disorder in Taiwan.

After adjusting for sex and calendar year, the HRs generally decreased from the first to the third trimester, and an association was observed in all three trimesters, except that the HR associated with each 10 μg/m 3 increase in the first trimester did not reach statistical significance ( Table 3 ).

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There is also an increasing trend in Asia.

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