Characteristics of participants taking part in the DNA damage/repair and DNA fragility studies
| Participants | N | Age | Sex | Smoking history | Pack-years | Chronic bronchitis | FEV1 % pred | FEV1/FVC% |
| Non-smokers | 7 | 51.6 (17.5) | 3M/4F | All never | 0 | 0 | ND | ND |
| Smokers | 15 | 69.5 (5.5) | 13M/2F |
| 48.9 (28.6) | 9 | 94.6 (19.9) | 75.4 (4) |
| COPD | 11 | 69 (6.7) | 11M |
| 43.6 (26.6) | 4 | 77.7 (15.6) | 64 (1.4) |
For patients with 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.
ND, not done in five participants; two had a FEV1/FVC ratio of 77(5.6)% of predicted.
M, male; F, female. Data expressed as mean (SD).