Demographics and spirometry of all participants
| Never-smokers | Smokers | Patients with COPD | |
|---|---|---|---|
| Subjects | n=57 | n=32 | n=66 |
| Age (year) | 64.4±4.3 | 66.3±2.7 | 68±3.5 |
| Men/women | 48/9 | 30/2 | 56/10 |
| Current/ex-smokers | 0/0 | 26/6 | 18/48 |
| Smoking history pack (year) | 0 | 37 (32–47) | 40 (36–48) |
| FEV1% predicted | 94.5±5.5 | 93.5±2.9 | 47.0±8.6 |
| FEV1/FVC% | 75.2±3.0 | 73.8±3.9 | 43.4±5.6 |
| Inhaled corticosteroid use | 0 | 0 | n=26 |
Data are presented as median (IQR) for smoking history, mean±SD for all others.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.