Risk of admission to hospital for COPD in subjects with lowest baseline tertile of FEV1 (% predicted) in the Copenhagen City Heart Study
| CCHS (n=1354) | Omitting first 5 years | ||||
|---|---|---|---|---|---|
| Smoking category | No of events | Crude hazard ratio (95% CI)* | Adjusted hazard ratio (95% CI)† | No of events | Adjusted hazard ratio (95% CI)‡ |
| Results from Cox’s proportional hazards regression analysis. | |||||
| *Adjusted for age and sex (total number of events = 286). | |||||
| †Multivariate analysis adjusted for age, sex, inhalation habits, and years of smoking (continuous). | |||||
| ‡Multivariate analysis and with exclusions of hospital admissions until 5 years after second examination (total number of events = 194). | |||||
| Heavy smokers | 232 | 1 | 1 | 165 | 1 |
| Quitters | 21 | 0.61 (0.39 to 0.96) | 0.69 (0.44 to 1.08) | 11 | 0.47 (0.25 to 0.87) |
| Light smokers | 6 | 0.35 (0.16 to 0.79) | 0.73 (0.31 to 1.71) | 5 | 0.96 (0.37 to 2.50) |
| Reducers | 27 | 1.33 (0.89 to 1.99) | 1.49 (1.00 to 2.23) | 13 | 1.15 (0.65 to 2.04) |