The psychometric properties of the Depression Anxiety Stress Scale-21 (DASS-21) Bangla version.

The Bangla version of the Depression Anxiety Stress Scale-21 (DASS-21-BV) draws huge attention among the researchers to assess the mental health status in various situations among the Bangladeshi adults. Since no published research article to date has assessed the psychometric properties of the scale (Bangla version), this study (n = 980 Bangladeshi adults) aimed to assess the psychometric characteristics of this scale utilizing both classical test theory (CTT) and item response theory (IRT) approaches. Item analysis results (item-total correlations in CTT and slope coefficients of the graded response model in IRT) suggested that items had satisfactory discrimination indices. The confirmatory factor analysis results supported the three-factor correlated model of the DASS-21-BV. This scale had good internal consistency reliabilities (alpha, omega, Rho coefficient, etc.) in both approaches. Additionally, multigroup confirmatory factor analysis results suggested strict invariance of this scale between males and females. Although the convergent and divergent validity of the DASS-21-BV were not assessed in this study, it was still proposed as a psychometrically sound tool to assess depression, anxiety, and stress in the non-clinical sample Bangladesh.