Baseline characteristics
| Variable | Patients | Mean±sd |
| Age at diagnosis years | 453 (100.0%) | 73.0±9.0 |
| Male | 295 (65.1%) | 72.3±8.8 |
| Female | 158 (34.9%) | 74.3±9.3 |
| BMI kg·m−2 | 355 (78.4%) | 28.4±5.2 |
| <25 | 93 (26.2%) | |
| 25–29.9 | 147 (41.4%) | |
| >30 | 115 (32.4%) | |
| Smoking | 438 (96.7%) | |
| Never smoker | 197 (45.0%) | |
| Ex-smoker | 210 (48.0%) | |
| Current smoker | 31 (7.0%) | |
| DLCO % predicted | 367 (81.0%) | 55.6±16.5 |
| FVC L | 407 (89.8%) | 2.8±0.8 |
| FVC % predicted | 407 (89.8%) | 80.2±18.2 |
| GAP stage | 370 (81.7%) | |
| GAP 1 | 200 (54.1%) | |
| GAP 2 | 151 (40.8%) | |
| GAP 3 | 19 (5.1%) |
BMI: body mass index; DLCO: diffusing capacity of the lung for carbon monoxide; FVC: forced vital capacity.