Table 1. Patient demographics and characteristics.
| Variables | Value |
|---|---|
| No patients | 250 |
| Gender, n [%] | |
| Females | 97 [39] |
| Males | 153 [61] |
| Age, mean [range] | 66 [22–81] |
| Smoking status, n [%] | |
| Ex-smokers | 126 [50] |
| Current smokers | 42 [17] |
| Never smokers | 81 [32] |
| Unknown | 1 [0.4] |
| Pulmonary function | |
| FEV1, L, mean ± SD | 2.37±0.78 |
| FEV1% predicted, mean ± SD [range] | 86±20 [21–133] |
| FVC, L, mean ± SD | 3.13±0.98 |
| FVC% predicted, mean ± SD [range] | 91±22 [21–164] |
| DLco% predicted, mean ± SD [range] | 59±14 [35–100] |
| 6MWTD | |
| Distance, m, mean ± SD [range] | 478±117 [100–888] |
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; DLco, diffusing capacity of the lungs for carbon monoxide; 6MWTD, six-minute walk test distance; SD, standard deviation.