Table 1 Classification of COPD by severity of impairment of percentage of predicted FEV1
From: Chronic obstructive pulmonary disease: towards pharmacogenetics
| Â | British | American and European |
|---|---|---|
Mild | 50-80 | 80-100 |
Moderate | >30 and <50 | >50 and <80 |
Severe | <30 | >30 and <50 |
Very severe | - | <30 |