title: Psychometric properties of the EQ-5D-5L in the general population of South Korea.
abstract: OBJECTIVE
  The EQ-5D-5L was developed to compensate for a high ceiling effect and lack of descriptive richness of the EQ-5D-3L. We evaluated psychometric properties of EQ-5D-5L in the general population.
  
  
  METHODS
  Six hundred of adults were sampled from the general population in South Korea using a multistage stratified quota sampling method. Participants completed the EQ-5D-5L, EQ-5D-3L, and SF-36v2. One hundred participants were resurveyed for reliability evaluation. The ceiling effect, known-groups construct validity, convergent and discriminant validity, and reliability of EQ-5D-5L were evaluated.
  
  
  RESULTS
  A smaller proportion of participants answered 'no problem' to all dimensions of EQ-5D-5L (61.2 %) than EQ-5D-3L (65.7 %, p < 0.01), indicating a reduced ceiling effect. Female, elderly, low-educated, and low-income participants reported health problems more frequently, indicating known-groups construct validity. The mobility dimension of EQ-5D-5L was better correlated with the physical component score (|r| = 0.48) than the mental component score (|r| = 0.25) of the SF-36v2, and the anxiety/depression dimension was better correlated with mental component score (|r| = 0.45) than physical component score (|r| = 0.34), indicating convergent and discriminant validity. The intraclass correlation coefficient of EQ-5D-5L index was 0.75.
  
  
  CONCLUSIONS
  The EQ-5D-5L has a smaller ceiling effect than the EQ-5D-3L and is a valid and reliable instrument to measure health-related quality of life in the general population.
authors.affiliation: Health Screening and Promotion Center, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-Gu, Seoul, 138-736, Republic of Korea.
authors.forename: Tae Hyup
authors.initials: TH
authors.lastname: Kim
authors.forename: Min-Woo
authors.initials: MW
authors.lastname: Jo
authors.forename: Sang-il
authors.initials: SI
authors.lastname: Lee
authors.forename: Seon Ha
authors.initials: SH
authors.lastname: Kim
authors.forename: Son Mi
authors.initials: SM
authors.lastname: Chung
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003863:Depression / Q000523:psychology; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods; D011159:Population Surveillance; D011203:Poverty; D011594:Psychometrics / Q000379:methods*; D011788:Quality of Life; D015203:Reproducibility of Results; D056910:Republic of Korea; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires / Q000592:standards*