title: Psychometric properties and confirmatory factor analysis of the CASP-19, a measure of quality of life in early old age: the HAPIEE study.
abstract: OBJECTIVE
  The aim was to assess the reliability and validity of the quality of life (QoL) instrument CASP-19, and three shorter versions of CASP-12 in large population sample of older adults from the HAPIEE (Health, Alcohol, and Psychosocial factors In Eastern Europe) study.
  
  
  METHODS
  From the Czech Republic, Russia, and Poland, 13,210 HAPIEE participants aged 50 or older completed the retirement questionnaire including CASP-19 at baseline. Three shorter 12-item versions were also derived from original 19-item instrument. Psychometric validation used confirmatory factor analysis, Cronbach's alpha, Pearson's correlation, and construct validity.
  
  
  RESULTS
  The second-order four-factor model of CASP-19 did not provide a good fit to the data. Two-factor CASP-12v.3 including residual covariances for negative items to account for the method effect of negative items had the best fit to the data in all countries (CFI = 0.98, TLI = 0.97, RMSEA = 0.05, and WRMR = 1.65 in the Czech Republic; 0.96, 0.94, 0.07, and 2.70 in Poland; and 0.93, 0.90, 0.08, and 3.04 in Russia). Goodness-of-fit indices for the two-factor structure were substantially better than second-order models.
  
  
  CONCLUSIONS
  This large population-based study is the first validation study of CASP scale in Central and Eastern Europe (CEE), which includes a general population sample in Russia, Poland, and the Czech Republic. The results of this study have demonstrated that the CASP-12v.3 is a valid and reliable tool for assessing QoL among adults aged 50 years or older. This version of CASP is recommended for use in future studies investigating QoL in the CEE populations.
authors: a Department of Epidemiology and Public Health , University College London , London , UK.
authors: Gyu Ri
authors: GR
authors: Kim
authors: Gopalakrishnan
authors: G
authors: Netuveli
authors: David
authors: D
authors: Blane
authors: Anne
authors: A
authors: Peasey
authors: Sofia
authors: S
authors: Malyutina
authors: Galina
authors: G
authors: Simonova
authors: Ruzena
authors: R
authors: Kubinova
authors: Andrzej
authors: A
authors: Pajak
authors: Simone
authors: S
authors: Croezen
authors: Martin
authors: M
authors: Bobak
authors: Hynek
authors: H
authors: Pikhart
mesh_terms: D000368:Aged; D000375:Aging / Q000523:psychology*; D018153:Czech Republic / Q000453:epidemiology; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011044:Poland / Q000453:epidemiology; D011594:Psychometrics / Q000295:instrumentation*; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D012179:Retirement / Q000706:statistics & numerical data*; D012426:Russia / Q000453:epidemiology; D011795:Surveys and Questionnaires / Q000592:standards*
keywords: CASP-19; old age; psychometrics; quality of life; well-being