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Exposure characteristics (n = 381)
| Exposure variable | Mean | ± SD | 25th percentile | 75th percentile |
|---|---|---|---|---|
| PM2.5, µg/m3 | ||||
| 1st trimester | 16.0 | ± 5.3 | 11.8 | 19.6 |
| 2nd trimester | 16.9 | ± 5.0 | 12.2 | 20.4 |
| 3rd trimester | 17.3 | ± 5.8 | 11.9 | 21.7 |
| Entire pregnancy | 16.7 | ± 2.3 | 15.2 | 18.2 |
