Clinical features of chronic obstructive pulmonary disease (COPD) patients and controls
| Patients with COPD | Control subjects | p-;value | |
| Subjects n | 88 | 40 | |
| Sex M:F | 88:3 | 40:0 | |
| Age yrs | 66.9±1.6 | 72.9±1.0 | ns |
| Brinkman's index | 1201.6±70.1 | 1071.1±66.5 | ns |
| Pulmonary function | |||
| FVC% pred | 77.4±2.2 | 95.9±3.8 | <0.0001 |
| FEV1 L | 1.1±0.1 | 2.4±1.4 | <0.0001 |
| FEV1/FVC% | 47.1±1.3 | 85.1±1.6 | <0.0001 |
Data are presented as the mean±sem
Brinkman's index: the number of cigarettes·day−1×the number of years
FVC: forced vital capacity; FEV1: forced expiratory volume in one second
NS: nonsignificant