Crude and adjusted odds ratios (ORs) with 95% confidence interval (CIs) of physician diagnosed asthma stratified by parental atopy in the relation between childhood asthma and air pollutants
| Parental atopy | Crude OR(95% CI) | Adjusted OR(95% CI)* | |
|---|---|---|---|
| *Two-stage hierarchical analysis adjusting for age, sex, parental education, environmental tobacco smoke (ETS), and visible mould. | |||
| NOx (10 ppb) | Yes | 1.00 (0.93 to 1.08) | 0.99 (0.92 to 1.07) |
| No | 1.04 (0.97 to 1.13) | 1.02 (0.95 to 1.10) | |
| CO (100 ppb) | Yes | 1.05 (1.01 to 1.09) | 1.04 (1.00 to 1.08) |
| No | 1.08 (1.04 to 1.12) | 1.06 (1.02 to 1.10) | |
| SO2 (10 ppb) | Yes | 0.76 (0.55 to 1.06) | 0.86 (0.62 to 1.21) |
| No | 0.70 (0.51 to 0.95) | 0.77 (0.56 to 1.07) | |
| PM10 (10 μg/m3) | Yes | 0.93 (0.89 to 0.96) | 0.94 (0.90 to 0.98) |
| No | 0.90 (0.87 to 0.94) | 0.92 (0.89 to 0.96) | |
| O3 (10 ppb) | Yes | 1.09 (0.89 to 1.33) | 1.15 (0.93 to 1.42) |
| No | 1.08 (0.90 to 1.30) | 1.20 (1.00 to 1.47) | |