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

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.