Table 3.
Concentrations of PM2.5 during pregnancy for non-LBW and LBW subjects.
| Concentration of PM2.5 (μg/m3) |
|||||
|---|---|---|---|---|---|
| Non-LBW |
LBW |
||||
| Pregnancy month | Mean ± SD | Median (min, max) | Mean ± SD | Median (min, max) | p-Valuea |
| 1 | 28.8 ± 12.8 | 26.2 (1.13, 84.6) | 33.2 ± 13.1 | 30.2 (11.0, 72.6) | 0.000 |
| 2 | 29.2 ± 12.6 | 26.5 (1.09, 82.4) | 33.6 ± 12.6 | 32.1 (12.4, 72.6) | 0.000 |
| 3 | 30.2 ± 13.6 | 27.2 (1.09, 84.6) | 32.6 ± 13.6 | 30.2 (8.02, 83.6) | 0.035 |
| 4 | 29.3 ± 13.7 | 26.0 (1.13, 86.1) | 31.3 ± 11.4 | 30.0 (10.6, 64.6) | 0.021 |
| 5 | 29.2 ± 12.7 | 26.8 (1.13, 84.5) | 33.4 ± 14.8 | 31.0 (11.0, 82.4) | 0.004 |
| 6 | 29.5 ± 13.8 | 26.4 (3.25, 86.1) | 30.4 ± 12.3 | 27.0 (10.6, 84.6) | 0.148 |
| 7 | 26.2 ± 13.6 | 26.2 (3.25, 84.8) | 29.7 ± 13.3 | 25.9 (4.48, 76.3) | 0.606 |
| 8 | 30.3 ± 16.0 | 25.8 (3.83, 86.1) | 30.6 ± 13.7 | 26.2 (9.94, 80.5) | 0.389 |
| 9 | 28.5 ± 14.0 | 25.1 (1.09, 84.8) | 29.6 ± 13.4 | 26.2 (5.99, 73.8) | 0.183 |
Abbreviations: max, maximum; min, minimum.
a
Comparison of PM2.5 concentrations between non-LBW and LBW subjects using the Mann–Whitney U test.