Table 1.
Basic Characteristics of the Cohort
| Number of Patients | ||
|---|---|---|
| Sex, n (%) | ||
| Female | 212 (27.1) |
782 |
| Male | 570 (72.9) | |
| Age at inclusion | 66.6 (9.2) | |
| BMI | 27.4 (6.2) | |
| Smoking, n (%) | ||
| Current-smoker | 159 (20.3) | |
| Ex-smoker | 538 (68.8) | |
| Non-smoker | 85 (10.9) | |
| mMRC, n (%) | ||
| 0 | 37 (4.7) | |
| 1 | 144 (18.4) | |
| 2 | 310 (39.6) | |
| 3 | 165 (21.1) | |
| 4 | 126 (16.1) | |
| CAT | 16.0 (7.8) | 775 |
| Symptoms, n (%) |
782 |
|
| Fatigue | 369 (47.7) | |
| Cough | 562 (71.9) | |
| Expectoration | 453 (57.9) | |
| Sputum | 46 (5.9) | |
| Lung functions | 782 | |
| FEV1 (% predicted) | 44.9 (11.7) | |
| FVC (% predicted) | 68.6 (17.6) | |
| FEV1/FVC (%) | 0.53 (0.12) | |
| TLco (% predicted) | 52.4 (21.9) | 509 |
| 6MWD (m) | 331.3 (131.7) | 598 |
| 6MWD (% predicted) | 61.9 (24.4) | |
Notes: Categorical parameters are described by absolute (relative) frequencies. Relative frequencies are calculated from valid data. Continuous variables are described by valid N and mean (standard deviation).
Abbreviations: CAT, COPD assessment test; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; FEV1/FVC, Tiffeneau index; m, meters; mMRC, modified Medical Research Council dyspnea scale; n, number of patients; TLco, diffusion capacity of the lungs for carbon monoxide; 6MWD, distance covered during 6-minute walk test.