In epidemiological studies, items about physician-diagnosed COPD are often used. There is a lack of validation and standardization of these items.
In a general population-based study, 1,050 subjects completed a questionnaire and performed spirometry, including forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) after inhalation of 400 µg of salbutamol. COPD was defined as the ratio of FEV1/FVC
Notes
Cites: Am Rev Respir Dis. 1986 Jun;133(6):981-6 PMID 3717770