Incidence of COPD stage 1, 2, and 3–4 among women participating in all four examinations from 1976 to 2004
| N at baseline | No COPD | COPD stage 1 | COPD stage 2 | COPD stage 3–4 | |
|---|---|---|---|---|---|
| Data are shown as n (%). | |||||
| Never smokers | 440 | 401 (91) | 13 (3) | 22 (5) | 4 (1) |
| Ex-smokers | 209 | 186 (89) | 10 (5) | 10 (5) | 3 (1) |
| Early cessation | 51 | 41 (80) | 4 (8) | 6 (12) | 0 (0) |
| Intermediary cessation | 72 | 54 (75) | 6 (8) | 9 (13) | 3 (4) |
| Late cessation | 116 | 83 (71) | 9 (8) | 17 (15) | 7 (6) |
| Continuous smokers | 358 | 246 (69) | 33 (9) | 71 (20) | 8 (2) |