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Table 7 Staging the bronchial obstruction

From: The AIMAR recommendations for early diagnosis of chronic obstructive respiratory disease based on the WHO/GARD model*

Severity FEV1/FVC after bronchodilatation %predicted FEV1
MILD < 70% > = 80%
MODERATE < 70% 50-80%
SEVERE < 70% 30-50%
VERY SEVERE < 70% < 30%