Demographic data of subjects
| Non-smokers | Healthy smokers | COPD patients | |
|---|---|---|---|
| FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity. | |||
| Data are presented as mean (SD). *p<0.0001 v non-smokers and healthy smokers. | |||
| Age (years) | 41 (17) | 48 (19) | 66 (11) |
| Sex (M:F) | 13:19 | 21:15 | 28:12 |
| Smoking history (pack years) | 0 | 27 (15) | 39 (3) |
| FEV1 (% predicted) | 99.3 (6) | 93.0 (12) | 50.1 (13)* |
| FEV1/FVC ratio | 0.9 (0.1) | 0.8 (0.1) | 0.5 (0.1)* |