Baseline characteristics table
| Clinical variable | Number of subjects | Median (IQR) |
| Age (years) | 187 | 60.1 (50.9–66.9) |
| Sex | 86M 101F (46%M, 54% F) | |
| Pack years for ex-smokers | 99 | 17 (8–27) |
| FEV1 (L) | 185 | 1.4 (0.9–1.9) |
| FEV1 per cent predicted | 185 | 51.1 (30.5–67.5) |
| FVC (L) | 185 | 3.6 (2.9–4.8) |
| FVC per cent predicted | 185 | 105.7 (88.2–123.4) |
| FEV1/FVC (%) | 185 | 36.9 (28.5–49.8) |
| Kco per cent predicted | 181 | 56.3 (46.0–69.6) |
| RV/TLC (%) | 140 | 41.5 (33.0–52.7) |
| Voxel index −950 HU (%) | 147 | 24.5 (15.4–35.2) |
| Perc15 (HU) | 147 | −965.2 (−974.8 to −950.7) |
| Total CAT score | 158 | 18.9 (12.0–25.0) |
| Total SGRQ score | 158 | 45.2 (33.3–62.1) |
Data are shown as median and interquartile ranges together with the number of patients where data were collected. All subjects were either never smokers or had ceased at least 1 year before the time of assessment. CAT score is only given for those where the total SGRQ score was also available.
CAT, COPD assessment tool; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; HU, hounsfield units; Kco, carbon monoxide transfer coefficient; RV/TLC, residual volume/total lung capacity; SGRQ, St George’s Respiratory Questionnaire.