Figure 3 The effect of PM10, PM2.5-10, and O3 exposure during pregnancy and postnatal period on eczema at 2 years of age. The binomial logistic was used as a linking function, comparing 2-year-old eczema patients with children who have not had eczema. The lag-response relationship between pollutant and eczema was modeled by natural cubic spline, according to the AIC value, with all the above degrees of freedom (DF) being 3. All pollutants were referenced at the 25th percentile to obtain their risk effects at the 75th percentile. All models were adjusted for paternal atopy, maternal work during pregnancy, maternal primipara, monthly household income, open windows often, and use air purifier.