Psychometric Study of Occupational Self Assessment – Chinese version for patients with schizophrenia in Taiwan

Abstract

Objective:

Functional performances were emphasized on the occupational therapy in mental health. However, lacking of standardized evaluation tools was noticed.The Occupational Self Assessment (OSA) was developed based on the model of human occupation and client- center intervention. The purpose of this study was to examine the psychometric properities of Chinese version of OSA.

OSA was translated into Mandarin by research members before testing. 93 patients diagnosed as schizophrenia were recruited from 2 community hospitals (either from day care program or outpatient department) in northern Taiwan. 51 of the subjects were accepted the retest of OSA within 2 weeks.

Method:
Rasch measurement model was selected to examine the construct validity. Items matching percentage of COPM and OSA and Spearman’s correlation between subjects Rasch score as well as COPM performance score and satisfaction score were used to examine the concurrent validity. Weighted Kappa was used to examine test- retest reliability.

Result:
The results of Rasch model measurement revealed that OSA had good construct validity. There were 73% items matched between OSA and COPM. Besides, moderate correlation was noted between Rasch score as well as COPM performance mean score and satisfaction mean score, which was suggested that OSA had moderate concurrent validity. Weighted kappa in 75% to 100% items of four subscales was up to 0.4, which was suggested that OSA had moderate test-retest reliability.

Discussion:
The research findings suggested that OSA had good psychometric properties, and can be applied in clinic to be a valid and reliable assessment tool.

Reference:
Wang, S. M. (2004). Psychometric Study of Occupational Self Assessment – Chinese version for patients with schizophrenia in Taiwan. Unpublished master’s thesis, National Taiwan University, Taipei.

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