Psychometric evaluation of the Disability Wellbeing Index (DWI) against the Adult Social Care Outcomes Toolkit (ASCOT) among people with disability.

Abstract

PURPOSE: The Disability Wellbeing Index (DWI) is a preference-based wellbeing measure developed among people with disabilities. This study examined the psychometric properties of the DWI in both its Standard and Easy English versions and compared them with two Adult Social Care Outcomes Toolkit (ASCOT) instruments, the ASCOT-SCT4 and ASCOT-ER. METHODS: We conducted an online survey among National Disability Insurance Scheme (NDIS) participants aged ≥ 15 years in 2024. DWI was scored using an Australian preference-based algorithm, and ASCOT was scored using UK preference weights. Convergent validity was assessed using Spearman's correlations between total utility scores and corresponding doma..