Participants | n | Age | Sex | Smoking history | Pack-years | Chronic bronchitis | FEV1 % pred | FEV1/FVC% |
Non-smokers | 9 | 71.2 (9.7) | 3M/6F | All never | 0 | 0 | 111.1 (16.4) | 84.6 (6.7) |
Smokers | 13 | 68.7 (7.5) | 11M/2F |
| 33.7 (20) | 5 | 96.7 (19.6) | 77.6 (4.5) |
COPD | 14 | 70.9 (4.1) | 11M |
| 37.7 (23.8) | 9 | 70.2 (16.2) | 61 (7.8) |
For chronic obstructive pulmonary disease (COPD) and smokers with normal lung function predicted forced expiratory volume in 1 s (FEV1% pred) and FEV1/forced vital capacity (FVC)% are post-bronchodilator values.
M, male; F, female. Data expressed as mean (SD).