Table 1. Characteristics of study populations.
| Nonsmoker | COPD | Smoker | |
|---|---|---|---|
| Sex (m/f) | 2/11 | 7/9 | 9/5 |
| Age (years) | 42·5 ± 10·6 | 65·6 ± 7·6* | 44·4 ± 7·6 |
| Non-smoker | 13 | 3 | na |
| Ex-smoker | – | 13 | na |
| Pack years | na | 26·8 ± 21·3 | 20·8 ± 14·0 |
| Stable disease | na | 10 | na |
| Exacerbation | na | 6 | na |
| FEV1,% predicted | nd | 61·3 ± 21·7 | nd |
| FEV1/FVC,% | nd | 64·6 ± 15·9 | nd |
M, male; f, female, FEV1, forced expiratory volume in one second,; FVC, forced vital capacity; na, not applicable; nd, not determined. Data are given as mean ± sd.
*
P < 0·0001 versus both control groups