Crude and adjusted odds ratios and 95% CI of low birth weight for trimester specific and pregnancy average total trihalomethane (TTHM) exposure among term births
| Low birth weight | ||||
|---|---|---|---|---|
| TTHM (μg/l) | First trimester | Second trimester | Third trimester | Pregnancy average |
| *Odds ratios adjusted for gestational age, infant gender, adequacy of prenatal care, maternal race, maternal education, maternal smoking, maternal age, parity, median household income, previous infant weighing 4000 g or more, previous preterm delivery, and maternal medical history (diabetes, eclampsia, hydramnios, chronic hypertension, hypertension during pregnancy, incompetent cervix, lung disease, renal disease, and uterine bleeding). | ||||
| Crude OR (95% CI) | ||||
| 0–60 | 1.0 | 1.0 | 1.0 | 1.0 |
| >60–80 | 1.06 (0.89 to 1.28) | 0.87 (0.71 to 1.07) | 0.97 (0.81 to 1.16) | 0.91 (0.77 to 1.08) |
| >80 | 0.93 (0.75 to 1.13) | 1.09 (0.92 to 1.30) | 1.11 (0.93 to 1.32) | 1.08 (0.89 to 1.31) |
| Adjusted OR (95% CI)* | ||||
| 0–60 | 1.0 | 1.0 | 1.0 | 1.0 |
| >60–80 | 1.13 (0.93 to 1.38) | 0.93 (0.75 to 1.15) | 1.08 (0.90 to 1.31) | 0.97 (0.81 to 1.26) |
| >80 | 0.98 (0.79 to 1.21) | 1.14 (0.95 to 1.38) | 1.09 (0.91 to 1.31) | 1.05 (0.85 to 1.29) |