Introduction: Several limitations were found among the existing functional assessments for people with severe mental illness (SMI) in Hong Kong (HK). The UCSD Performance-based Skills Assessment- 2 Extended Range Version (UPSA-2ER) was identified to be a suitable assessment tool to amend these limitations.
Objectives: This study aims to translate and adapt the UPSA-2ER to use in Hong Kong. Key psychometric properties would be examined.
Methods: The UPSA-2ER was translated and adapted to suit the societal and cultural background of HK. Expert panel was used to review the content validity. The UPSA-2ER was administered to a total of 240 HK Chinese people with SMI to examine the inter-rater reliability, internal consistency, structural validity and predictive validity with classification accuracy of the assessment tool. 66 of these subjects completed another functional assessment, the Chinese Functional Needs Assessment (CFNA) to examine the concurrent validity.
Results: Relevance and representativeness were confirmed by expert panel members. Inter-rater reliability was excellent (ICC=0.986 to 0.998). Internal consistency was excellent (α=0.973). Rasch analysis suggested that the 104-item UPSA-2ER had a unidimensional structure, the variance explained by the items was 43.5% and the unexplained variance in the 1st contrast was 4.4%. Classification & Regression Tree analysis showed that the UPSA-2ER correctly classified more than 75% of the subjects into corresponding functional levels. For concurrent validity, the UPSA-2ER demonstrated high correlation with the CFNA (r=0.822).
Conclusion: This study has evaluated the key psychometric properties and examined the applicability of the UPSA-2ER. Results presented satisfactory psychometric properties when in use with people with SMI in HK.