Joon Young Choi,1 Hyoung Kyu Yoon,2 Kyeong-Cheol Shin,3 So-Young Park,4 Chang Youl Lee,5 Seung Won Ra,6 Ki Suck Jung,7 Kwang Ha Yoo,4 Chang-Hoon Lee,8 Chin Kook Rhee9
1Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, St. Vincents Hospital, The Catholic University of Korea, Suwon, Republic of Korea; 2Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Yeouido St Marys Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea; 3Division of Pulmonology and Allergy, Regional Center for Respiratory Disease, Yeungnam University Medical Center, Daegu, Republic of Korea; 4Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Republic of Korea; 5Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chuncheon Sacred Heart Hospital, Hallym University Medical Center, Chuncheon, Republic of Korea; 6Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea; 7Division of Pulmonary Medicine, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University Medical School, Anyang, Republic of Korea; 8Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; 9Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Seoul St. Marys Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
Correspondence: Chin Kook RheeDivision of Pulmonary, Allergy and Critical Care Medicine, Department of Internal Medicine, Seoul St. Marys Hospital, College of Medicine, The Catholic University of Korea, 222 Banpodaero, Seochogu, Seoul 06591, Republic of KoreaTel +82 2 2258 6067Fax +82 2 599 3589Email chinkook77@gmail.com
Purpose: Previous studies have used various definitions to classify chronic obstructive pulmonary disease (COPD) patients into chronic bronchitis (CB) and non-CB patients. This study was performed to identify differences among three definitions of CB based on the classical method, St. Georges Respiratory Questionnaire (SGRQ), and the CAT (COPD Assessment Test) score.Patients and methods: We extracted data from the multicenter Korea COPD Subgroup Study (KOCOSS) cohort, for which patients recruited from among 47 medical centers in South Korea beginning in April 2012. Patients were classified according to three different definitions of CB: 1) classical definition; 2) SGRQ (using questions regarding cough and sputum); and 3) CAT score (comprising cough [CAT1] and sputum [CAT2] subscale scores).Results: A total of 2694 patients were enrolled in this study. The proportions of CB were 10.8%, 35.8%, and 24.0% according to the classical, SGRQ, and CAT definitions, respectively. The three definitions yielded consistently significant differences between CB and non-CB patients in modified Medical Research Council dyspnea scale CAT score, SGRQ score, number of moderate-to-severe exacerbations per year and forced expiratory volume in 1 second. By three definitions, CB consistently predicted future risk of exacerbation. The kappa coefficient of agreement between the classical definition and SGRQ definition was 0.29, that of the classical definition and CAT definition was 0.32, and that of the SGRQ definition and CAT definition was 0.44.Conclusion: Patients with CB according to the new definitions based on SGRQ or CAT score showed similar clinical characteristics to those defined according to the classical definition. The new CB definitions may be used as alternatives to the classical definition.
Keywords: chronic bronchitis, CAT score, SGRQ score, chronic obstructive pulmonary disease, KOCOSS database
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CAT Score and SGRQ Definitions of Chronic Bronchitis as an Alternative | COPD - Dove Medical Press
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