Table 3.
Estimated difference in birth weight (in grams) associateda with 1 μg/m3 higher ambient average PM2.5 during the specified trimester.
| Cohort | Bootstrap Correction | Trimester | Estimate | Std. Err | 95% CI |
|---|---|---|---|---|---|
| Restrictedb | None | 1 | −1.5 | 0.82 | (−3.1, 0.1) |
| 2 | −1.6 | 0.83 | (−3.2, 0.1) | ||
| 3 | −2.4 | 0.78 | (−3.9, −0.8) | ||
| Non-Parametric | 1 | −1.5 | 0.84 | (−3.2, 0.1) | |
| 2 | −1.6 | 0.85 | (−3.3, 0.0) | ||
| 3 | −2.5 | 0.85 | (−4.2, −0.8) | ||
| Parameter | 1 | −1.6 | 1.01 | (−3.5, 0.4) | |
| 2 | −1.6 | 0.98 | (−3.5, 0.4) | ||
| 3 | −2.4 | 0.92 | (−4.2, −0.6) | ||
| Statewide | None | 1 | 0.28 | 0.54 | (−0.78, 1.3) |
| 2 | −0.62 | 0.55 | (−1.7, 0.45) | ||
| 3 | −0.66 | 0.51 | (−1.7, 0.35) |
CI indicates confidence interval.
a
All models are adjusted for gestational week, infant sex, being firstborn, maternal age, maternal race, maternal education, maternal tobacco, and alcohol use during pregnancy, census tract poverty, county, and conception date.
b
Restricted cohort limited to births to mothers residing in a county with a PM2.5 monitor.