Psychometric properties of the self-report version of the strengths and difficulties questionnaire in the Ecuadorian context: an evaluation of four models

BMC Psychology
Paúl Arias-Medina

Abstract

This study evaluates the psychometric properties of four models of the Strengths and Difficulties Questionnaire (SDQ) in a sample of 1470 children and adolescents from Biblián, Ecuador. The instrument has been used by researchers and students. However, there are not reports that show that the instrument is valid or reliable in the Ecuadorian context. Reliability was evaluated through Cronbach's Alpha, McDonald's Omega, Intra-class Correlations and Greatest Lower Bound (GLB). Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) with polychoric correlation matrix and Diagonally Weighted Least Square (DWLS) estimator is performed in each model. Due to possible readability problems, CFA was performed in three age groups. Measurement invariance analysis across biological sex and two groups of age is carried out. CFA and reliability analysis revealed poor construct validity of the original version of SDQ. Three additional factor structures were tested. A version that includes a prosocial subscale, and ҅ internalizing ҆ subscale and an ҅ externalizing ҆ subscale has the best yet insufficient construct validity properties among the four models (CFI = .858, TLI = .844, RMSEA = .055, WRMR = 1.588). Cronbach's Alpha fo...Continue Reading

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