This study aimed to analyze the psychometric qualities of the Escala Baptista de Depressão (Versão Adulto) - EBADEP-A based on Item Response Theory - IRT and Classical Test Theory - TCT. Initially, adjustment parameters on the model, both regarding to items and to people, were considered good fit values, with a low percentage of mismatches. In relation to the reliability, both Cronbach's alpha and the Rasch index were considered great. The study of differential functioning presented 17 items with response bias, 11 favoring the female group and 6 the male one. As for the analysis based on TCT, it was performed an ANOVA to analyze the criterion groups, and the EBADEP-A was able to discriminate the non-depressed, college students, psychiatric and depressive groups. These results were considered as evidence of construct validity and criterion, respectively, complementing the variety of evidence ever found for the scale.
Differential item functioning; Item response theory; Classical test theory; EBADEP-A; Validity
