Clinical features of patients
| Non-smokers (n=5) | Smokers (n=12) | COPD (n=15) | |
|---|---|---|---|
| Sex (female/male) | 4/1 | 2/10 | 3/12 |
| Age (years) | 64 (56–72) | 63 (52–76) | 65 (54–74) |
| Tobacco consumption, pack-years | 0 | 40 (33–46) | 36 (28–43) |
| FEV1, % predicted | 102 (97–108) | 91 (90–100) | 71 (55–79) |
| FVC, % predicted | 104 (93–108) | 96 (92–106) | 94(91–101) |
| FEV1/FVC % | 95 (91–101) | 85 (77–91) | 63 (54–68) |
| Pao2, mm Hg | 89 (85–93) | 85 (81–90) | 80 (78–83) |
| Paco2, mm Hg | 38 (36–41) | 37 (35–40) | 40 (38–42) |
Data are shown as median (IQR).
Pack-year=1 year smoking 20 cigarettes per day.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; Pao2, oxygen tension in arterial blood; Paco2, carbon dioxide tension in arterial blood; % pred, % predicted.