title: Reliability and validity of the St George's Respiratory Questionnaire for asthma.
abstract: 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.
  
  
  METHODS
  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 (% FEV(1) of predicted r = -0.314, P < 0.001; % FVC of predicted r = -0.224, P < 0.001; FEV(1)/FVC r = -0.224, P < 0.001), asthma severity (r = 0.278, P < 0.001) and history of asthma exacerbation.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Division of Allergy and Clinical Immunology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
authors.forename: Y-J
authors.initials: YJ
authors.lastname: Bae
authors.forename: Y S
authors.initials: YS
authors.lastname: Kim
authors.forename: C-S
authors.initials: CS
authors.lastname: Park
authors.forename: Y S
authors.initials: YS
authors.lastname: Lee
authors.forename: Y-S
authors.initials: YS
authors.lastname: Chang
authors.forename: Y S
authors.initials: YS
authors.lastname: Cho
authors.forename: A-S
authors.initials: AS
authors.lastname: Jang
authors.forename: S-H
authors.initials: SH
authors.lastname: Cho
authors.forename: B W
authors.initials: BW
authors.lastname: Choi
authors.forename: S-G
authors.initials: SG
authors.lastname: Kim
authors.forename: H-B
authors.initials: HB
authors.lastname: Moon
authors.forename: T-B
authors.initials: TB
authors.lastname: Kim
mesh_terms: D000328:Adult; D001249:Asthma / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D015203:Reproducibility of Results; D056910:Republic of Korea; D011795:Surveys and Questionnaires