Fig. 3
From: PM2.5 constituent exposures and maternal circulatory homocysteine in early pregnancy
Associations of an IQR increase in average PM2.5 and constituent exposures during the post-conception period with percentage changes in serum Hcy in all participants (n = 324), EPL group (n = 162), and NEP group (n = 162). Note: The independent variables included average concentration of PM2.5 or each constituent in (A), replaced by residual of each constituent in (B), and also included Ln5-MeTHF, all demographic characteristics presented in Table 1, temperature, relative humidity, and group (EPL or NEP). The IQRs of concentration of PM2.5, BC, OM, NO3–, NH4+, and SO42– in the analyses were 29, 1.1, 5.8, 6.7, 3.6, and 2.5 µg/m3, respectively. The IQRs of residual of BC, OM, NO3–, NH4+, and SO42– in the analyses were 0.2, 0.9, 1.5, 0.9, and 1.1, respectively