Table 3 Comparison of median exposure of air pollutants over the entire pregnancy between cases and controls among the included 2709 preterm births
From: Effect of ambient air pollution on premature SGA in Changzhou city, 2013–2016: a retrospective study
Air pollutants (μg/m3) | SGA* (median, SD*) | P | |
|---|---|---|---|
Control | Case | ||
PM2.5* | |||
Trimester1 | 53.97, 21.71 | 54.02, 22.19 | 0.233 |
Trimester2 | 60.27, 20.42 | 60.54, 20.84 | 0.134 |
Trimester3 | 61.32, 15.52 | 61.68, 16.32 | 0.303 |
Whole gestation | 53.59, 15.84 | 55.69, 16.86 | 0.451 |
SO2* | |||
Trimester1 | 28.42, 16.49 | 29.49, 16.77 | 0.356 |
Trimester2 | 28.85, 10.56 | 29.62, 8.22 | 0.452 |
Trimester3 | 29.69, 8.22 | 30.38, 8.68 | 0.615 |
Whole gestation | 26.45, 8.43 | 26.67, 8.92 | 0.734 |
NO2* | |||
Trimester1 | 39.63, 22.25 | 40.42, 22.38 | 0.493 |
Trimester2 | 39.85, 14.91 | 39.89, 14.77 | 0.547 |
Trimester3 | 44.05, 7.18 | 44.20, 7.72 | 0.265 |
Whole gestation | 38.18, 10.41 | 38.27, 10.75 | 0.944 |