Buxton, H;
Gomes, M;
Gafoor, R;
Taylor, Z;
Totsika, V;
(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)
, Article e13189. 10.1111/jar.13189.
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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.
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