Prevalence of spirometry-defined COPD by smoking status
| COPD | Total(N = 8215) | Never smokers(N = 3686) | Ex-smokers(N = 2551) | Smokers(N = 1978) |
|---|---|---|---|---|
| Data shown as % (N). | ||||
| a,b,cDifferent letters indicate significant group differences (p<0.02). | ||||
| Mild | 5.5 (455) | 4.9 (180)a | 5.5 (141)a,b | 6.8 (134)b |
| Moderate | 5.8 (480) | 3.1 (116)a | 7.1 (180)b | 9.3 (184)c |
| Severe/very severe | 1.9 (158) | 0.7 (26)a | 2.7 (68)b | 3.2 (64)b |
| Overall | 13.3 (1093) | 8.7 (322)a | 15.2 (389)b | 19.3 (382)c |