3.2 Concentrations of air pollutant exposure in the early life
The exposure to pollutants during pregnancy, 1 year after birth and 2
years after birth of the study subjects was shown in Table 2. Higher
levels of pollutant exposure during pregnancy than after birth and
higher levels of pollutant exposure in the first year after birth than
in the second year after birth (all P -values < 0.001).
In Table 3, the pollutant exposure of eczema and non-eczema subjects in
different exposure periods was compared. Only pollutant concentrations
during pregnancy differed significantly between eczema and non-eczema
populations (P <0.001), with only NO2concentrations differing during the other periods. In Figure S1, we
showed changes in the concentration of pollutants during pregnancy among
subjects at different conception dates. Figure S2 showed the correlation
between the pollutants at different exposure periods, with a strong
correlation between the pollutants.
Table 2 Exposure concentrations of air pollutants in different stages of
early life.