Table 7.
Crude and adjusted ORsa for preterm births < 30 weeks.
| Exposure (entire pregnancy) | Cases (n) | Crude OR (95% CI) | Adjustedb OR (95% CI) |
|---|---|---|---|
| NO–IDW (10 μg/m3) | 241 | 1.15 (1.03–1.28) | 1.18 (1.03–1.35) |
| NO–LUR (10 μg/m3) | 235 | 1.09 (0.98–1.21) | 1.06 (0.94–1.19) |
| NO2–IDW (10 μg/m3) | 241 | 1.12 (0.94–1.33) | 1.10 (0.91–1.34) |
| NO2–LUR (10 μg/m3) | 235 | 1.15 (0.88–1.50) | 1.09 (0.82–1.45) |
| CO–IDW (100 μg/m3) | 192 | 1.06 (0.94–1.19) | 1.04 (0.91–1.20) |
| PM2.5–IDW (1 μg/m3) | 200 | 1.22 (1.01–1.48) | 2.01 (1.38–2.92) |
| PM2.5–LUR (1μg/m3) | 235 | 1.07 (0.99–1.14) | 1.05 (0.97–1.13) |
| BC–LUR (10−5/m) | 235 | 1.02 (0.92–1.14) | 1.00 (0.90–1.11) |
| PM10–IDW (1 μg/m3) | 241 | 1.17 (1.04–1.32) | 1.18 (1.01–1.38) |
| SO2–IDW (1 μg/m3) | 238 | 1.02 (0.97–1.07) | 1.01 (0.95–1.06) |
BC, black carbon.
a
ORs per standardized increases (in parentheses), roughly corresponding to interquartile range.
b
Adjusted for infant sex, First Nations status, parity, maternal age, maternal smoking during pregnancy, month–year of birth, income (quintile-census), maternal education (quartile-census).