title: Validation of World Health Organization Assessment Schedule 2.0 in specialized somatic rehabilitation services in Norway.
abstract: The World Health Organization Disability Assessment Schedule (WHODAS) 2.0 is a generic instrument to assess disability covering six domains. The purpose of this study was to investigate the potential of the instrument for monitoring disability in specialized somatic rehabilitation by testing reliability, construct validity and responsiveness of WHODAS 2.0, Norwegian version, among patients with various health conditions.
  
  
  
  For taxonomy, terminology and definitions, the Consensus-based Standards for the Selection of Health Measurement Instruments were followed. Reproducibility was investigated by the intra-class correlation coefficient (ICC) in a randomly selected sample. Internal consistency was assessed by Cronbach's alpha. Construct validity was evaluated by correlations between WHODAS 2.0 and the Medical Outcomes Study 36-item Short Form, and fit of the hypothesized structure using confirmatory factor analysis (CFA). Responsiveness was evaluated in another randomly selected sample by testing a priori formulated hypotheses.
  
  
  
  Nine hundred seventy patients were included in the study. Reproducibility and responsiveness were evaluated in 53 and 104 patients, respectively. The ICC for the WHODAS 2.0 domains ranged from 0.63 to 0.84 and was 0.87 for total score. Cronbach's alpha for domains ranged from 0.75 to 0.94 and was 0.93 for total score. For construct validity, 6 of 12 expected correlations were confirmed and CFA did not achieve satisfactory fit indices. For responsiveness, 3 of 8 hypotheses were confirmed.
  
  
  
  The Norwegian version of WHODAS 2.0 showed moderate to satisfactory reliability and moderate validity in rehabilitation patients. However, the present study indicated possible limitations in terms of responsiveness.
authors: Centre for Habilitation and Rehabilitation, Haukeland University Hospital, Østre Nesttunveg 2, 5221, Bergen, Norway. vegard.pihl.moen@helse-bergen.no.|Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway. vegard.pihl.moen@helse-bergen.no.
authors: Vegard Pihl
authors: VP
authors: Moen
authors: Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.
authors: Jorunn
authors: J
authors: Drageset
authors: Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.|Centre for Clinical Research, Haukeland University Hospital, Bergen, Norway.
authors: Geir Egil
authors: GE
authors: Eide
authors: National Advisory Unit on Rehabilitation in Rheumatology, Department of Rheumatology, Diakonhjemmet Hospital, Oslo, Norway.
authors: Mari
authors: M
authors: Klokkerud
authors: Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway.
authors: Sturla
authors: S
authors: Gjesdal
mesh_terms: D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009664:Norway; D011788:Quality of Life / Q000523:psychology*; D012046:Rehabilitation / Q000379:methods*; D015203:Reproducibility of Results; D012107:Research Design; D014944:World Health Organization
keywords: Disability; Rehabilitation; Reliability; Responsiveness; Validity; WHODAS 2.0