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ROC curves for the five questionnaires using the study population. Abbreviations: CDQ: COPD Diagnostic Questionnaire; COPD-PS: COPD Population Screener; COPD-SQ: COPD Screening Questionnaire; CAPTURE: COPD assessment in Primary Care to Identify Undiagnosed Respiratory Disease and Exacerbation Risk. LFQ: the Lung function questionnaire.
