Figure 3.
Association between weekly particulate matter with a diameter less than or equal to 2.5 μm (PM2.5) levels over gestation and asthma onset. This figure demonstrates the association between PM2.5 over gestation and asthma onset by age 6 years using distributed lag models assuming week-specific effects, stratified by sex. The models adjusted for maternal age at enrollment, race and ethnicity, education, prepregnancy obesity, prenatal and postnatal smoking status, and prenatal stress. The y-axis shows the odds ratio (OR) of asthma in relation to a 10 μg/m3 increase in prenatal PM2.5 exposure; the x-axis depicts gestational age in weeks. The solid line shows the predicted OR, and the gray area indicates the 95% confidence interval. A sensitive window is identified when the estimated pointwise 95% confidence interval does not include zero.