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Demographics of COPD patients and control subjects.
| Variables | COPD | Controls | P-value |
|---|---|---|---|
| Subjects, n | 331 | 213 | |
| Age, years | 61±10 | 58±12 | |
| Male, n (%) | 298 (90) | 209 (98) | |
| Female, n (%) | 33 (10) | 4 (2) | |
| Pack-years | 41±34 | 38±17 | |
| FEV1/FVC | 54±13.8a | 85±7.6 | <0.05 |
| FEV1 predicted, % | 49±18.1a | 88±17.0 | <0.05 |
P<0.05, verses control. Data are presented as the means ± standard deviation. COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 sec; FVC, forced vital capacity.
