Table 3 Crude and adjusted odds ratios (OR) and for premature birth by pollution exposure
From: Maternal exposure to low-level air pollution and pregnancy outcomes: a population-based study
Exposure | Crude odds ratio | Adjusted* odds ratio |
|---|---|---|
OR (95%CI) | OR (95%CI) | |
Formaldehyde Categorical variable (tertiles) | ||
1 (reference) | ||
2 | 0.98 (0.68–1.40) | 1.11 (0.72–1.71) |
3 | 1.16 (0.82–1.63) | 1.37 (0.91–2.05) |
Continuous variable (per 5 μg/m3 increase in concentration) | ||
1.03 (0.76–1.40) | 1.07 (0.77–1.49) | |
Nitrogen dioxide Categorical variable (tertiles) | ||
1 (reference) | ||
2 | 1.01 (0.70–1.46) | 1.14 (0.77–1.68) |
3 | 1.40 (0.99–1.98) | 1.68 (1.15–2.46) |
Continuous variable (per 10 μg/m3 increase in concentration) | ||
1.16 (1.01–1.34) | 1.25 (1.07–1.46) | |