Psychometric Properties of the Persian CASP in Adolescents With Autism Spectrum Disorder

Abstract

The Child and Adolescent Scale of Participation (CASP) requires further psychometric validation across languages to assess participation in adolescents with autism spectrum disorder (ASD). This study evaluated the psychometric properties of the Persian CASP in adolescents with ASD. The study involved 100 adolescents with ASD and 50 typically developing peers, assessing reliability and validity using Persian CASP, confirmatory factor analysis (CFA), discriminant, and convergent validity. The Persian CASP showed excellent internal consistency (Cronbach’s α = 0.94) and test–retest reliability (ICC = 0.95). CFA with the diagonally weighted least squares estimator supported a one-factor model, with moderate fit: comparative fit index = 0.925, normed fit index = 0.895, goodness-of-fit index = 0.750, root mean square error of approximation = 0.108, chi-square/degree of freedom ratio = 3.05. Factor loadings ranged from 0.45 to 0.78. Participation differed significantly between groups (p < 0.001). Strong PedsQL correlations supported convergent validity. The Persian CASP demonstrates good reliability and validity, though CFA results indicate only moderate model fit.

Plain Language Summary

Psychometric Properties of the Persian Version of the CASP in Adolescents With ASD

This study aimed to evaluate the psychometric properties of the Persian version of the Child and Adolescent Scale of Participation (CASP) in adolescents with autism spectrum disorder (ASD). The results indicated that the Persian CASP demonstrated strong reliability, internal consistency, and validity. The scale effectively differentiated between adolescents with ASD and their typically developing peers, revealing significant differences in participation levels. The confirmatory factor analysis showed a satisfactory fit for the proposed factor structure, reinforcing the scale’s construct validity. Strong positive correlations between the CASP and the Pediatric Quality of Life Inventory confirm its convergent validity. In addition, excellent test–retest reliability was observed, with all subscales showing strong consistency over time. The findings highlight the effectiveness of the CASP as a tool for assessing participation in adolescents with ASD, making it suitable for use in clinical and research settings across various languages and cultures.

Keywords

participation autism psychometrics adolescents

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