Table 1 Clinical characteristics of smokers without airflow limitation and COPD patients
| Â | Smokers | COPD |
|---|---|---|
Number | 17 | 14 |
Age | 56 ± 17 | 69 ± 8 |
Male/Female | 17/0 | 13/1 |
Current/ex-smokers | 14/3 | 8/6 |
Pack-years | 23 ± 3 | 27 ± 6 |
Post-BD FEV1% predicted | 92.9 ± 9.0 | 29.0 ± 10.6 |
GOLD Stage | Â | Â |
 I | - | 0 |
 II | - | 2 |
 III-IV | - | 12 |