Development of a Computerized Adaptive Testing System of the World Health Organization Disability Assessment Schedule 2.0 (CAT–WHODAS 2.0) for People With Dementia

The CAT-WHODAS 2.0 can provide efficient, reliable, valid, and sex-unbiased assessments of disability for people with dementia. It may serve as an alternative for clinicians and researchers to optimize the efficiency of data collection. Plain-Language Summary: This article presents the computed adaptive testing of the World Health Organization Disability Assessment Schedule 2.0 (CAT-WHODAS 2.0) as an efficient solution to provide reliable, valid, and sex-unbiased assessments of disability among people with dementia. The CAT-WHODAS 2.0 is a promising alternative for clinicians because it can efficiently assess a person's level of disability with extremely high reliabilities in the six domains of functioning (cognition, mobility, self-care, getting along, life activities, and participation). The CAT-WHODAS 2.0 is also useful for researchers because its scores are comparable with those of the item bank, which consists of 27 items calibrated by the Rasch model.