From: Effect of ambient air pollution on premature SGA in Changzhou city, 2013–2016: a retrospective study
Characteristic | SGA a [n (%)] | Mean PM2.5 (μg/m3) | Mean SO2 (μg/m3) | Mean NO2 (μg/m3) |
---|---|---|---|---|
gender | ||||
male | 250 (9.4) | 51.22 | 76.55 | 105.75 |
female | 189 (7.1) | 50.98 | 76.12 | 105.55 |
P | 0.000 * | 0.849 | 0.725 | 0.354 |
Maternal age (years) b | ||||
< 20 | 16 (0.6) | 48.85 | 72.73 | 105.36 |
20–30 | 296 (11.4) | 51.05 | 76.33 | 105.82 |
30–40 | 112 (4.3) | 51.51 | 76.66 | 104.65 |
> 40 | 7 (0.3) | 50.77 | 75.76 | 108.82 |
P | 0.000 * | 0.290 | 0.458 | 0.666 |
Birth years | ||||
2013 | 32 (1.2) | 49.75 | 70.29 | 110.77 |
2014 | 130 (4.0) | 49.70 | 73.64 | 113.37 |
2015 | 136 (4.8) | 50.05 | 75.43 | 100.40 |
2016 | 141 (5.2) | 53.48 | 80.72 | 102.55 |
P | 0.747 | 0.079 | 0.279 | 0.571 |
Season of birth | ||||
Spring | 96 (3.5) | 52.06 | 77.91 | 103.21 |
Summer | 105 (3.9) | 46.87 | 67.37 | 101.65 |
Fall | 126 (4.7) | 51.85 | 77.68 | 107.75 |
Winter | 112 (4.1) | 53.19 | 81.47 | 109.05 |
P | 0.562 | 0.001* | 0.000 * | 0.000 * |
Natural delivery | ||||
No | 110 (4.1) | 49.43 | 74.13 | 104.31 |
Yes | 329 (12.1) | 52.42 | 78.10 | 106.71 |
P | 0.000 * | 0.549 | 0.000 * | 0.127 |
Parity | ||||
Once | 151 (5.6) | 50.68 | 75.43 | 106.23 |
Twice or more | 288 (10.6) | 51.68 | 77.37 | 105.97 |
P | 0.000 * | 0.368 | 0.715 | 0.729 |