Table 3—

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
Subjects n373471
No COPD: FEV1/FVC% >7078%50%65%
Stage 1 COPD: FEV1/FVC% <70; FEV1% pred >8019%32%25%
Stage 2 COPD: FEV1/FVC% <70; FEV1% pred <803%18%10%
  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • % pred: % predicted