3.5 Combined effects of different periods of exposure to air pollutants on eczema in children
Pollutants during pregnancy and the first year after birth were included in the WQS model. For per 25 percentiles increased in the WQS index of combined exposure to pollutants, the risk of eczema at 1 year of age was increased by 1.38 times (95%CI : 1.14-1.66), O3during pregnancy played a major role in the combined effect, and SO2, O3, CO and PM in the first year of birth also played an important role (Figure 4).