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Objective: To conduct a discussion about the strategies to assess the factorial structure of psychometric instruments using like an example the Body Shape Questionnaire (BSQ). Methods: We evaluated seven different factorial models of the BSQ that were obtained through exploratory factorial analysis (EFA) and are presented in the literature. The confirmatory factor analysis of these models was performed for study sample using the indices chi-square per degree of freedom ratio (c/df), Comparative Fit Index (CFI), Tucker1 Universidade Estadual Paulista (Unesp), Faculdade de Ciências Farmacêuticas, Departamento de Alimentos e Nutrição, Araraquara, São Paulo, Brasil. 2 Instituto Universitário de Ciências Psicológicas, Sociais e da Vida (ISPA-IU), William James Center for Research (WJCR), Lisboa, Portugal. Endereço para correspondência. Juliana Alvares Duarte Bonini Campos Faculdade de Ciências Farmacêuticas, Departamento de Alimentos e Nutrição Rodovia Araraquara-Jaú, Km 01, Campos Ville 14800-903 – Araraquara, SP, Brasil Telefone: +55 (16) 3301-6935 E-mail: jucampos@fcfar.unesp.br Palavras-chave Análise fatorial, instrumentos, validação, imagem corporal. 202 COMUNICAÇÃO BREVE J Bras Psiquiatr. 2018;67(3):201-7 da Silva WR, et al. Lewis index (TLI), Root Mean Square Error of Approximation (RMSEA), and Weighted Root Mean Square Residual (WRMR). Convergent and discriminant validities were assessed by the average variance extracted and coefficient of determination among BSQ factors, respectively. Reliability was assessed using the composite reliability and the Cronbach’s alpha coefficient. Results: 739 female college students with a mean age of 20.4 (standard deviation = 2.4) participated. All models assessed showed adequate fit for the study sample, however, the discriminant validity was inadequate in the all models. Furthermore, composite reliability of the models was adequate. Conclusion: Although all tested models of BSQ showed good psychometric indicators, it is worth noting that they were obtained in different samples using the EFA and without theoretical plausible justification for the construction of the factors, which may make it difficult to choose a model for clinical use. Therefore, considering the importance of preserving the theoretical concept during the development of an instrument, we suggest to researchers and clinicians who are cautious about the use of models without theoretical support.

Avaliação da estrutura fatorial do Body Shape Questionnaire: análise fatorial exploratória ou confirmatória?