Fig. 1From: The cutoff point of clinical chronic obstructive pulmonary disease questionnaire for more symptomatic patientsPatient disposition. Abbreviations: CCQ, Clinical COPD Questionnaire; COPD, chronic obstructive pulmonary disease; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SGRQ, St. George’s Respiratory Disease QuestionnaireBack to article page