Baseline characteristics of study patients
| No. of patients | 57 (43 M, 14 F) |
| Age (years) | 66.7 (7.8) |
| FEV1 (l) | 1.04 (0.35) |
| FEV1(% predicted) | 39.5 (16.7) |
| FVC (l) | 2.46 (0.65) |
| FEV1/FVC (%) | 43.7 (15.4) |
| Pao 2 (kPa) | 8.92 (0.89) |
| Paco 2 (kPa) | 5.87 (0.76) |
| Salbutamol reversibility (%) | 9.7 (11.5) |
Values are mean (SD).
FEV1 = forced expiratory volume in one second; FVC = forced vital capacity; Pao 2, Paco 2 = arterial oxygen and carbon dioxide tensions.