Demographic and lung function characteristics of study subjects
| N | Mean (SD) | |
|---|---|---|
| FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity; Tlco=carbon monoxide transfer factor. | ||
| *Normal range 10.84 (2.52) mmol/min/kPa. | ||
| Patients with complete data | 660 | |
| Pre-salbutamol FEV1 (l) | 660 | 1.28 (0.46) |
| Pre-salbutamol FEV1 (% predicted) | 660 | 45.5 (14.9) |
| Pre-salbutamol FVC (l) | 660 | 2.94 (0.76) |
| Pre-salbutamol FEV1/FVC | 660 | 0.43 (0.11) |
| Tlco (mmol/min/kPa)* | 556 | 4.91 (2.10) |
| Age (years) | 660 | 63.8 (7.0) |
| Pack years smoked | 615 | 44.6 (32.4) |
| Current smokers/ex-smokers | 314/345 | 48%/52% |
| M/F | 497/163 | 75%/25% |
| Atopic/non-atopic | 175/485 | 27%/73% |
| Previous use of regular inhaled steroids (yes/no) | 353/307 | 53%/47% |