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