Evaluation of Validity and Reliability of Body Shape Questionnaire (BSQ) Indonesian Version: Rasch Mixture Model Approach

Feliana Setiawan; Bryan Andhika; Ananta Yudiarso

doi:10.17977/um023v14i12025p%p

Evaluation of Validity and Reliability of Body Shape Questionnaire (BSQ) Indonesian Version: Rasch Mixture Model Approach

Feliana Setiawan, Bryan Andhika, Ananta Yudiarso

Abstract

This study aims to evaluate and validate the Body Shape Questionnaire version 8C (BSQ-8C) in Indonesian using the Rasch Model and Rasch Mixture Model with 408 respondents. The analysis results indicate that the instrument is unidimensional (eigenvalue 12.5; 60.9%), with high reliability (person reliability 0.85; item reliability 0.99). The rating scale functions well, with Andrich thresholds increasing consistently (-1.21 to 1.47), although the category “Never” shows an Outfit MNSQ value that needs improvement. Item fit analysis reveals measures (-0.63 to 0.73) and PT-measure correlations (0.68–0.77), with some items requiring revision, such as item 16. The Wright Map indicates adequate distribution of respondent abilities, while Differential Item Functioning (DIF) analysis shows no significant bias based on gender. The Rasch Mixture Model identified two latent classes reflecting diverse response patterns, supporting the two-class model as the best based on decreases in AIC, BIC, and CAIC values. Overall, the Indonesian BSQ-8C demonstrates good validity and reliability in measuring body image perception within the Indonesian population. The Rasch model analysis indicates that the scale tends to measure participants' agreement at a moderate level, necessitating improvements in certain items.

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DOI: http://dx.doi.org/10.17977/um023v14i12025p%25p