Per cent of healthy elderly subjects in the reference sample with chronic obstructive pulmonary disease (COPD) as defined by Global Initiative for Chronic Obstructive Lung Disease (GOLD) workshop summary
| Age yrs | |||
| 70–79 | >80 | All | |
| Subjects n | 37 | 34 | 71 |
| No COPD: FEV1/FVC% >70 | 78% | 50% | 65% |
| Stage 1 COPD: FEV1/FVC% <70; FEV1% pred >80 | 19% | 32% | 25% |
| Stage 2 COPD: FEV1/FVC% <70; FEV1% pred <80 | 3% | 18% | 10% |
FEV1: forced expiratory volume in one second
FVC: forced vital capacity
% pred: % predicted