Crude and adjusted relative risks of small for gestational age for trimester specific and pregnancy average total trihalomethane (TTHM) exposure among term births
| Small for gestational age | ||||
|---|---|---|---|---|
| TTHM (μg/l) | First trimester | Second trimester | Third trimester | Pregnancy average |
| *Odds ratios adjusted for adequacy of prenatal care, 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 (0.97 to 1.17) | 1.05 (0.95 to 1.16) | 1.03 (0.94 to 1.13) | 1.06 (0.98 to 1.15) |
| >80 | 1.11 (1.09 to 1.23) | 1.20 (1.10 to 1.31) | 1.09 (1.05 to 1.26) | 1.27 (1.15 to 1.40) |
| Adjusted OR (95% CI)* | ||||
| 0–60 | 1.0 | 1.0 | 1.0 | 1.0 |
| >60–80 | 1.00 (0.89 to 1.10) | 0.99 (0.89 to 1.10) | 0.98 (0.89 to 1.09) | 1.00 (0.92 to 1.09) |
| >80 | 1.09 (0.98 to 1.21) | 1.13 (1.03 to 1.24) | 1.03 (0.94 to 1.14) | 1.14 (1.02 to 1.26) |