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Free Content Reliability and validity of the St George's Respiratory Questionnaire for asthma

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BACKGROUND: The St George's Respiratory Questionnaire (SGRQ) is a self-administered questionnaire that has been used to evaluate the health-related quality of life of patients with chronic respiratory diseases.

OBJECTIVE: To assess the validity and reliability of the SGRQ for a large population with asthma.

DESIGN: We used the previously developed Korean version of the SGRQ (SGRQ-K) to assess 676 asthma patients enrolled from the Cohort for Reality and Evolution of Adult Asthma in Korea study. Cronbach's α was used to assess test reliability and Pearson's correlation coefficient was used to assess the correlation between SGRQ scores and various clinical factors.

RESULTS: The total SGRQ-K score had acceptable reliability (Cronbach's α = 0.92). The total SGRQ-K score was significantly correlated with symptom duration (r = 0.157, P < 0.001), pulmonary function (% FEV1 of predicted r = −0.314, P < 0.001; % FVC of predicted r = −0.224, P < 0.001; FEV1/FVC r = −0.224, P < 0.001), asthma severity (r = 0.278, P < 0.001) and history of asthma exacerbation.

CONCLUSION: With the exception of the SGRQ-K symptoms, SGRQ-K is a reliable and valid test for evaluation of the quality of life of patients with asthma. Scores were well correlated with duration of symptoms, lung function and previous history of asthma exacerbation.
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Keywords: St George's Respiratory Questionnaire; asthma; chronic obstructive pulmonary disease; reliability; validity

Document Type: Regular Paper

Affiliations: 1: Division of Allergy and Clinical Immunology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea; Health Promotion Center, Asan Medical Center, Seoul, Korea 2: Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea 3: Department of Allergy, Internal Medicine, Haeundae Paik Hospital, Inje University, Busan, Korea 4: Division of Allergy and Clinical Immunology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea; Clinical Research Center for Chronic Obstructive Airway Disease, Seoul, Korea 5: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea 6: Division of Allergy and Clinical Immunology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea; and Clinical Research Center for Chronic Obstructive Airway Disease, Seoul, Korea 7: Department of Internal Medicine, Soonchunhyang University, Bucheon, Korea 8: Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul, Korea 9: Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, Seoul, Korea

Publication date: 2011-07-01

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