Validity and reliability of the Brazilian version of the World Health Organization Disability Assessment Schedule in blind people

ABSTRACT The World Health Organization Disability Assessment Schedule (WHODAS 2.0) is a tool developed by the World Health Organization (WHO) to measure functioning and disability, supporting the ICF model. The Brazilian version of WHODAS 2.0 was translated and made available for use by WHO in 2015. Thus, this study aims to validate the Brazilian version of WHODAS 2.0 for use in blind people. Participants were 56 blind people (mean age: 48.4 ± 13.6) years. Two assessment tools were used, the 36-item version of WHODAS 2.0 and the World Health Organization Quality of Life-BREF (WHOQOL-bref). The psychometric properties tested were internal consistency, test-retest and criterion validity. There was good test-retest reliability (ICC≥0.63). Cronbach’s alpha values showed good internal consistency in most areas, except in the subdomain of school or work activities (α = 0.55). The validity criterion was adequate, with moderate correlations between WHODAS 2.0 domains and WHOQOL-bref areas. The results indicated the validity of the WHODAS 2.0 for assessing the functionality of blind people.