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Age- and sex-stratified prevalence of moderate to severe airway obstruction (FEV1/FVC <0.7 and FEV1 <80% predicted) and spirometric restriction (FEV1/FV >0.7 and FEV1 <80%), defined using National Health and Nutrition Examination Survey reference ranges, among those completing American Thoracic Society standard spirometry (n = 749). Upper panel depicts the prevalence of spirometric abnormalities among men; lower panel depicts the prevalence of spirometric abnormalities among women.
