A study of the psychometric properties of 12-item World Health Organization Disability Assessment Schedule 2.0 in adults living in Poland

Abstract

Background: Assessment of population disability is an important part of public health management. This article presents the psychometric properties of the World Health Organization Disability Assessment Schedule 2.0 12-item version (WHODAS 2.0 v 12) assessing adults living in Poland. Methods: The analysis comprised 584 adult urban residents. The study used WHODAS 2.0 v 12 and WHOQL-BREF. Basic sociodemographic and selected health assessment (pain, depressive moods) data were also collected. Results: A high internal consistency was found in the general population for the entire tool (α-Cronbach=0.90) and for individual domains (α-Cronbach in the range of 0.76 - 0.79). The similar situation was of dispersion groups (with pain, depressive moods). Satisfactory values of fit indices were obtained: CFI = 0.999, TLI = 0.999, and RMSEA = 0.004, SRMR = 0.043, p = 0.454. A good consistency was noted over time (correlation coefficient = 0.88). A high validity of the tool was found, including satisfactory discriminant validity of people with different health status and a good convergent validity in correlation with the WHOQOL-BREF questionnaire. Conclusions: The results allow WHODAS 2.0 v 12 to be considered as a high-quality tool for measuring health status, functioning and disability of a general and particular population.