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Clinical characteristics of patients with COPD and controls
| Control | COPD stage IV | |
| Number | 8 | 10 |
| Age, years | 65 (7)* | 58 (2)* |
| Sex (m/f) | 4/4 | 2/8 |
| Pack-years smoking | 34 (17)† | 40 (12) |
| FEV1%pred | 95 (11)† | 21 (4) |
| FEV1/FVC % | 76 (4) | 31 (10) |
Mean (SD).
*P<0.05 control vs COPD.
†No information available w.r.t pack-years in one control and FEV1%pred in two controls.
FEV1, forced expiratory volume in one second; FVC, forced vital capacity.
