Incidence of COPD stage 1, 2, and 3–4 among men and women participating in the first and fourth examinations only
| N at baseline | No COPD | COPD stage 1 | COPD stage 2 | COPD stage 3–4 | |
|---|---|---|---|---|---|
| Data are shown as n (%). | |||||
| Women | |||||
| Never smokers | 493 | 449(91) | 15 (3) | 24 (5) | 5 (1) |
| Ex-smokers | 259 | 228 (88) | 13 (5) | 14 (5) | 4 (2) |
| Quitters | 286 | 217 (76) | 22 (8) | 36 (13) | 11 (4) |
| Continuous smokers | 422 | 294 (70) | 38 (9) | 80 (19) | 10 (2) |
| Men | |||||
| Never smokers | 174 | 165 (95) | 8 (5) | 1 (1) | 0 (0) |
| Ex-smokers | 207 | 181 (87) | 9 (4) | 14 (7) | 3 (1) |
| Quitters | 263 | 215 (82) | 12 (5) | 29 (11) | 7 (3) |
| Continuous smokers | 338 | 206 (61) | 47 (14) | 67 (20) | 18 (5) |