Fig. 4From: The cutoff point of clinical chronic obstructive pulmonary disease questionnaire for more symptomatic patientsThe area under the receiver operating curve to compare the concordance of SGRQ according to CCQ cut-off level. Abbreviations: AUC, area under curve; CCQ, Clinical Chronic Obstructive Pulmonary Disease Questionnaire; SGRQ, St. George’s Respiratory Disease QuestionnaireBack to article page