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Demographic characteristic of cases and controls
| Characteristics | Control | COPD Patients | OR (95% CI) | P |
|---|---|---|---|---|
| Female | 86 | 66 | 1.0 | - |
| Male | 114 | 134 | 1.53(1.02-2.29) | 0.039 |
| Non-smokers | 99 | 74 | 1.0 | - |
| Smokers | 101 | 126 | 1.67(1.12-2.48) | 0.012 |
| Average age (±SD) | 44.2 ± 14.4 | 52.1 ± 15.5 | - | <0.001 |
