Table 1.
Prevalence of COPD as a Function of Severity1
| Degree of Bronchial Obstruction | Prevalence |
|---|---|
| FEV1 < 80% | 7.2% |
| FEV1 < 75% | 5.6% |
| FEV1 < 70% | 3.6% |
| FEV1 < 65% | 2.4% |
| FEV1 < 50% | 1% |
| FEV1 < 35% | 0.4% |
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