Rasch Modeling and Differential Item Functioning of the Self-Stigma Scale-Short Version Among People With Three Different Psychiatric Disorders
Abstract
Self-stigma is prevalent in individuals with psychiatric disorders and can profoundly affect people. A unified assessment with sound psychometric properties is needed for evaluating self-stigma across psychiatric conditions. The aim of this study was to examine the psychometric properties of the Self-Stigma Scale-Short version (SSS-S) using Rasch modeling. Six-hundred and twelve participants with substance use disorders (n = 319), attention-deficit/hyperactivity disorder (n = 100), and schizophrenia (n = 193) completed the SSS-S. Rasch results confirmed the unidimensionality of the nine items of the SSS-S. The four-point Likert scale of the SSS-S reflected monotonical increases along the self-stigma continuum. No ceiling or floor effects were detected. Among the three subdomains of the SSS-S, cognitive items appeared to be the most robustly endorsed, and behavioral items were the least endorsed. Two items in the SSS-S displayed differential item functioning across the three diagnoses. Additionally, SSS-S scores showed weak to moderate correlation with depression, anxiety, and stress scale scores. The SSS-S had overall satisfactory psychometric properties. Healthcare professionals may use this assessment to assess self-stigma in multiple psychiatric groups, and information gained may facilitate improved care.
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Citation
Fan, C.-W., Chang, K.-C., Lee, K.-Y., Yang, W.-C., Pakpour, A. H., Potenza, M. N., & Lin, C.-Y. (2022). Rasch modeling and differential item functioning of the Self-Stigma Scale-Short Version among people with three different psychiatric disorders. International Journal of Environmental Research and Public Health, 19(14), 8843. https://doi.org/10.3390/ijerph19148843