Psychometric validity of the Montgomery and Åsberg Depression Rating Scale for Youths (MADRS-Y)

Background Because of all the serious consequences of major depressive disorder (MDD), it is important to screen for MDD in adolescents. The aim of this study was to test the psychometric properties of the newly developed self-report depression scale MADRS-Y for adolescents in a normative Swedish sample. Methods The study included 620 adolescents in the age range of 12-20 years old. The normative sample was randomly split into two equal parts, to perform principal component analysis (PCA) on sample one and confirmatory factor analysis (CFA) on sample two. We investigated the psychometrics. Results The result from the PCA suggested that all 12 potential items should be used, and the items loaded on the same construct of depression. The CFA supported the one-factor structure with good fit indices. Measurement invariance was confirmed, allowing interpretation regardless of gender or age differences. Reliability was good, alpha .89, for both samples separately. Test-retest reliability was good to excellent (intraclass correlation coefficients = .87 and .91). Evidence of convergent and discriminant validity was shown. Conclusions The results in the current study suggest that the MADRS-Y is a brief, reliable, and valid self-report questionnaire of depressive symptoms for adolescents in the general population.