title: Psychometric evaluation of the Korean version of the Diabetes Symptom Checklist-Revised (DSC-R) for patients with type 2 diabetes.
abstract: BACKGROUND
  This study was to elucidate the psychometric properties of the Korean version of the Diabetes Symptom Checklist-Revised (K-DSC-R), which is a patient-reported outcome measure of diabetes symptom burden.
  
  
  METHODS
  A sample of 432 Korean patients with diabetes was recruited from university hospitals. The data were analyzed using exploratory factor analysis (EFA), confirmatory factor analysis (CFA), multitrait/multi-item correlation, Pearson's correlation, t-test, ANOVA, and Cronbach's alpha for construct, item-convergent/discriminant, concurrent, and known-groups validity, and internal consistency reliability.
  
  
  RESULTS
  EFA extracted a total of 29 items clustered into 7 subscales from the K-DSC-R. The construct of the seven-subscales was supported by CFA. The scaling success rates of item-convergent validity were 100% for all subscales, and those of item-discriminant validity ranged from 83.3% to 100%. Patients in more-depressed groups and in the HbA1c-uncontrolled group had higher K-DSC-R scores, satisfying the known-groups validity. The subscales of the K-DSC-R were moderately correlated with health-related quality of life, indicative of the established concurrent validity. The Cronbach's alpha of the K-DSC-R was 0.92.
  
  
  CONCLUSIONS
  The psychometric properties of the K-DSC-R have been established. It is thus appropriate for use with respect to reliability and validity in practice and clinical trials for Korean patients with type 2 diabetes.
authors.affiliation: Graduate School of Public Health, Ajou University, 164 Worldcup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-380, Republic of Korea. ehlee@ajou.ac.kr.
authors.forename: Eun-Hyun
authors.initials: EH
authors.lastname: Lee
authors.forename: Kwan-Woo
authors.initials: KW
authors.lastname: Lee
authors.forename: Rhayun
authors.initials: R
authors.lastname: Song
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Snoek
authors.forename: Seung Hei
authors.initials: SH
authors.lastname: Moon
mesh_terms: D057189:Checklist; D017281:Cost of Illness; D003430:Cross-Sectional Studies; D003863:Depression / Q000175:diagnosis; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis*; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D056910:Republic of Korea