Characteristics of the subjects
| Group | Young adults | Control subjects | Patients with emphysema |
| Subjects n | 12 | 6 | 9 |
| Sex M:F | 6:6 | 6:0 | 9:0 |
| Age yrs | 22.7±1.05 | 68.2±3.12 | 71.1±1.05 |
| Smoking pack-yrs | 0 | 37.2±6.2 | 69.6±12.3 |
| FEV1 L | 3.62±0.27 | 2.19±0.21 | 0.75±0.07 |
| FEV1 % pred | 98.3±3.41 | 94.9±6.94 | 34.3±3.21 |
| VC % pred | 109.0±4.61 | 95.1±8.81 | 76.0±3.45 |
Data are presented as mean±sd unless otherwise stated
FEV1: forced expiratory volume in one second
VC: vital capacity
% pred: percentage of predicted. All long volumes were measured seated