Figure 4. Effect of combined exposure to air pollutants during pregnancy
and in the first year of life on the risk of eczema at 1 year of age.
The direction of the association between exposure to air pollutants and
childhood eczema was set as positive. The model was adjusted for
paternal atopy, maternal work during pregnancy, maternal primipara,
monthly household income, open windows often, and use air purifier.
Pollutants during pregnancy, one year after birth, and the second year
after birth were all included in the WQS model. For per 25 percentiles
increased in the WQS index of combined exposure to pollutants, the risk
of cumulative eczema in children before 2 years of age increased by 1.28
times (95%CI : 1.06-1.55), in which O3 in
pregnancy played a major role (Figure 5).