Table 4 Multivariable-adjusted ORs for COPD in Anhui
| Â | OR (95% CI) | P value |
|---|---|---|
Age at survey (years) | 1.06 (1.04, 1.08) | 0.003 |
Sex (men) | 2.01 (1.22, 3.33) | 0.021 |
Rural residence | 1.12 (0.90, 1.40) | 0.198 |
Educational level | ||
 Primary school or lower | 1.61 (1.12, 2.31) | 0.025 |
 Secondary school | 1.07 (0.75, 1.53) | 0.582 |
 Higher or further education | 1.00(ref) |  |
Smoking status | ||
 Never smoker | 1.00(ref) |  |
 Former smoker | 1.15 (0.27, 4.98) | 0.775 |
 Current smoker | 2.63 (1.86, 3.73) | 0.003 |
Hospital admission for severe pulmonary disease in childhood | 0.34 (0.02, 6.43) | 0.324 |
Indoor exposure to biomass for cooking or heating | 1.05 (0.65, 1.69) | 0.767 |
Indoor exposure to coal for cooking or heating | 1.55 (1.11, 2.15) | 0.024 |
Exposure to dust or chemicals in the workplace | 0.85 (0.49, 1.46) | 0.402 |
Family history of lung disease | 1.50 (1.17, 1.93) | 0.014 |
History of tuberculosis | 1.77 (0.64, 4.84) | 0.171 |
Body-mass index (kg/m2) | ||
 < 18.5 | 0.49 (0.08, 2.96) | 0.298 |
 18.5–23.9 | 1.00(ref) |  |
 24.0–27.9 | 0.75 (0.34, 1.65) | 0.325 |
 ≥28.0 | 0.59 (0.35, 1.01) | 0.052 |