Characteristics of study subjects
| COPD (n=21) | Normal (n=12) | |
|---|---|---|
| FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity. | ||
| Mean (SD) age (years) | 66 (8) | 56 (4) |
| M/F | 11/10 | 8/4 |
| Pack years smoking | 38 (27) | 0 |
| FEV1 (% predicted) | 51 (13) | 91 (5) |
| FVC (% predicted) | 67 (21) | 103 (11) |
| FEV1/FVC% | 52 (5) | 90 (6) |