Totsika, Vaso (2024) Measuring quality of life of adults with intellectual disabilities: Psychometric evaluation of the personal outcomes scale in the United Kingdom. Journal of Applied Research in Intellectual Disabilities, 37 (2). ISSN 1468-3148

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Abstract

Background - The Personal Outcomes Scale (POS) is a scale developed to measure quality of life of adults (18+) with intellectual disability. Previous studies have reported good fit for Spanish and Portuguese language versions of POS. Aims - This study aimed to evaluate the factor structure of the English language version of POS when used to measure the quality of life of adults (18+) with intellectual disability in the UK. Materials and Methods - Analysis was conducted on POS data from 310 adults with an intellectual disability. First and second order factor models and multi-level models were used to assess fit. Results - There was poor fit to the data for all tested models. We estimated that 23% of variance in POS scores was accounted for by interviewer cluster. Discussion - This was the first UK-based evaluation of POS and our data did not confirm the factor structure of the POS measure. The identification of systematic variability within the dataset indicates that inter-rater reliability is a potential limitation of the POS tool. Conclusion - Further research is needed to investigate inter-rater reliability of POS interviewers and to explore factor structure.

Item Type:	Article
Additional Information:	Received: 30 September 2022. Revised: 19 September 2023. Accepted: 8 December 2023. First published: 02 January 2024
Uncontrolled Keywords:	Factor analysis, Intellectual disability, Psychometric testing, Quality of life
Subjects:	Disabilities & Disorders (mental & physical) > Special Needs - Social Work Disabilities & Disorders (mental & physical) > Mental Disorders Disabilities & Disorders (mental & physical) > Mental Handicap
Department/People:	Research
URI:	https://repository.tavistockandportman.ac.uk/id/eprint/2891

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