Control nonsmoker | COPD stage II# | |
Subjects n | 6 | 5 |
Female % | 17 | 0 |
Age years | 61 (49–73) | 66 (64–69) |
Smoking status | Nonsmoker | Current¶ |
FEV1 % predicted | 113 (89–129) | 65 (49–79) |
Data are presented as median (range), unless otherwise stated. COPD: chronic obstructive pulmonary disease; FEV1: forced expiratory volume in 1 s. #: COPD patients were included based on the Global Initiative for Chronic Obstructive Lung Disease standard [1]; ¶: ≥10 pack-years.