Prenatal pollution linked to lower cognitive scores in infants
were measured in micrograms per meter cubed . Pollution estimates are recorded hourly and daily and were then averaged across the prenatal period. We first examined the entire prenatal period, estimated as the average exposure during the 9 months prior to birth since information regarding timing of conception was unavailable. We then looked at each individual monthly lag of pregnancy exposure to search for critical windows.
All statistical models adjusted for SES, number of breast feedings per day, infant gestational age , pre-pregnancy BMI , infant birthweight and infant sex. These covariates were chosen by examining choice covariates in relevant literature. However, univariate associations between prenatal exposures and neurodevelopment outcomes are also reported in Supplemental Table
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