Table 5
Logistic regression of pollutants for risk of COPD
| Crude OR (95% CI) | p Value | Adjusted OR (95% CI)† | p Value | |
|---|---|---|---|---|
| SO2, sulphur dioxide; NO2, nitrogen dioxide; PM10, particulate matter with aerodynamic diameter ⩽10 μm; CO, carbon monoxide. | ||||
| *Scores from principal components analysis of concentrations of SO2, NO2, PM10 and CO. | ||||
| †Adjusted by area, age group, environmental tobacco smoke exposure, occupational exposure to dust, respiratory disease in family, cough in childhood and local exhaust ventilation in kitchen. | ||||
| Pollutants* | 1.27 (0.89 to 1.81) | 0.193 | 1.29 (0.83 to 2.01) | 0.361 |
| SO2 | 4.79 (2.51 to 9.16) | <0.001 | 1.80 (1.04 to 3.11) | 0.036 |
| NO2 | 2.27 (1.86 to 2.78) | <0.001 | 1.28 (0.79 to 2.09) | 0.321 |
| PM10 | 1.66 (1.26 to 2.19) | <0.001 | 1.10 (0.93 to 1.30) | 0.254 |
| CO | 1.15 (1.10 to 1.20) | <0.001 | 1.01 (0.98 to 1.04) | 0.379 |
