Demographic and clinical features of the patient group
| Males | 58.88 |
| Age yrs | 50.29 (42.5–58.1) |
| Never-smoked | 23.7 |
| Pack-yrs smoked | 14.00 (1.9–26.1) |
| High-risk occupation | 25.5 |
| Low-risk occupation | 23.1 |
| Never-exposed | 51.4 |
| FEV1/FVC | 39.60 (26.6–52.6) |
| FEV1 % pred | 34.79 (14.54–55.04) |
| KCO % pred | 66.10 (49.05–83.15) |
| UZVI | 29.75 (16.48–43.02) |
| LZVI | 48.30 (32.18–64.42) |
| Incidence of known vascular disease | 3.62 |
| Incidence of known malignancy | 0 |
Data are presented as % or median (interquartile range). FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; % pred: % predicted; KCO: transfer coefficient; UZVI: upper zone voxel index; LZVI: lower zone voxel index.