Characteristics of the subjects
| COPD* | Control smokers | Control non-smokers |
|---|---|---|
| (n=13) | (n=13) | (n=11) |
| Female, n (%) | ||
| 7 (54%) | 5 (38%) | 7 (64%) |
| Age (years), median (range) | ||
| 63 (50–73) | 53 (39–70) | 58 (43–76) |
| Smoking status | ||
| Ex (n=8)† | Yes† | No |
| Current (n=5)† | ||
*FEV1 less than 50% of predicted and FEV1/FVC less than 70%.
†Ten or more pack-years.
COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.