Internalized Stigma of Mental Illness Scale - Thai Version: Translation and Assessment of Psychometric Properties Among Psychiatric Outpatients in Central Thailand

This paper reports the translation of the English Internalized Stigma of Mental Illness scale into Thai and assessment of its psychometric properties. After forward- and backward-translation, Thai experts completed the content validity index with item agreements of .86 to 1.00. Data were collected from 390 psychiatric clinic patients in central Thailand using systematic random sampling. Unweighted least squares factor analysis with Promax rotation identified five subscales. Cronbach's alpha for scale reliability was .88, and correlations for construct validity ranged from r = .55 to .69. These findings support the validity and reliability of the Thai version of the scale.