The cutoff point of clinical chronic obstructive pulmonary disease questionnaire for more symptomatic patients View Full Text


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Article Info

DATE

2018-02-27

AUTHORS

Yong Suk Jo, Sangshin Park, Deog Kyeom Kim, Chul-Gyu Yoo, Chang-Hoon Lee

ABSTRACT

BackgroundAn adequate threshold for the Clinical Chronic Obstructive Pulmonary Disease (COPD) Questionnaire (CCQ) defining more symptomatic COPD patients has not been determined. We aimed to determine the efficacy of the CCQ and the appropriate CCQ threshold for more symptomatic COPD patients.MethodsCOPD patients aged > 40 years who smoked/had smoked ≥10 packs/year were prospectively enrolled over 1 year from three South Korean hospitals (n = 126). Correlations between the CCQ and St. George’s Respiratory Questionnaire (SGRQ), COPD Assessment Test (CAT), the modified Medical Round Council (mMRC) scale, lung function, and exercise capacity were evaluated. “More symptomatic patients” were those with an SGRQ score ≥ 25. Area under the receiver operating curve and classification and regression tree analyses were performed to determine the CCQ threshold equivalent to an SGRQ score ≥ 25.ResultsThe CCQ significantly correlated with the SGRQ, CAT, and mMRC scale (r = 0.76, 0.69, and 0.53, respectively). A CCQ cutoff of 1.4 predicted an SGRQ score of 25 better than others. A CCQ score of 1.4 was a significant determinant of an SGRQ score ≥ 25 even after adjusting for potential confounders.ConclusionsThe CCQ was correlated with other symptom indicators, lung function, and exercise capacity. A CCQ cutoff of 1.4 agreed better than CCQ cutoff of 1.0, suggested by guideline, and this cutoff value may identify more symptomatic COPD patients well.Trial registrationClinicalTrials.gov Identifier: NCT02527486. Date of registration: December 19, 2014, retrospectively registered. More... »

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38

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https://www.ncbi.nlm.nih.gov/pubmed/29482616


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