Reliability and validity of the Basic Depression Questionnaire
- PMID: 33767735
- PMCID: PMC7969818
- DOI: 10.1016/j.ijchp.2019.07.002
Reliability and validity of the Basic Depression Questionnaire
Abstract
Depressive disorders have a high prevalence around the world. They present a great comorbidity with other disorders like anxiety, thereby making a differential diagnosis very difficult. The Basic Depression Questionnaire was designed to palliate this issue by isolating specific depression symptoms. Our aim is to study the reliability, factorial structure, and differential item functioning of this questionnaire.
Method: The sample consisted of 1,397 adults without psychological problems (M age = 29.76, SD = 11.25, 64.78% women) who completed the CBD.
Results: We observed that none of the items presented differential functioning. A monofactorial structure was established. In this model a good fit was obtained by confirmatory factor analysis and a strict invariance by sex. The ordinal alpha was used to check the reliability and it fetched an index of .95.
Conclusions: The Basic Depression Questionnaire has adequate psychometric properties. The absence of differential item functioning and the invariance by sex are guarantees of an adequate use to diagnose depression for men and women. So, its clinical use can help to differentiate between the specific diagnoses for depressive disorders and anxiety disorders.
Los trastornos depresivos tienen una elevada prevalencia a nivel mundial. Presentan una gran comorbilidad con otros trastornos como la ansiedad, lo que hace muy difícil su diagnóstico diferencial. El Cuestionario Básico de Depresión (CBD) fue diseñado para aislar los síntomas específicos de la depresión y así paliar este problema. El objetivo de este estudio es analizar la fiabilidad, la estructura factorial y el funcionamiento diferencial de los ítems del CBD. Método: La muestra estuvo compuesta de 1.397 adultos sin problemas psicológicos (64,78% mujeres, M edad = 29,76, DT = 11,25) a los que se le administró el CBD. Resultados:Se observó que ninguno de los ítems presentaba funcionamiento diferencial. Se obtuvo una estructura monofactorial. En dicho modelo se obtuvo un buen ajuste mediante análisis factorial confirmatorio y una invarianza estricta por sexo. Se usó el alfa ordinal para comprobar la fiabilidad, obteniendo un índice de 0,95. Conclusiones: El Cuestionario Básico de Depresión tiene adecuadas propiedades psicométricas. La ausencia de funcionamiento diferencial del ítem y la invarianza por sexo son garantías de un adecuado uso para diagnosticar depresión en hombres y mujeres. Por ello, su uso clínico puede ayudar al diagnóstico específico de trastornos depresivos frente a trastornos de ansiedad.
Keywords: Basic Depression Questionnaire; Depression; Differential item functioning; Instrumental study; Invariance.
© 2019 Asociación Española de Psicología Conductual. Published by Elsevier España, S.L.U.
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