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Original Article

The Bifactor Model of the Strengths and Difficulties Questionnaire

Published Online:January 01, 2013https://doi.org/10.1027/1015-5759/a000160

Abstract

The Strengths and Difficulties Questionnaire (SDQ) is a frequently used instrument developed for screening childhood mental health problems. The aim of this study is to clarify the structure of the Hungarian version of SDQ, to test previous measurement models, and to propose an alternative bifactor model. Data were collected from a community sample of 8–13-year-old children. We conducted a series of confirmatory factor analyses on parent (n = 383) and teacher ratings (n = 391). The classic five-factor, an alternative three-factor, and a bifactor model were estimated. In the bifactor model, specific components refer to the five SDQ-traits, and the General Problems factor refers to an impression about the problem severity of the child. For both informants, the bifactor model yielded the best fit to the data compared to other models. Childhood behavioral problems can be best described as a multidimensional construct, which has implications regarding the screening procedure in various samples.

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