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Abstract(s)
Objetivo: Conduzir uma discussão sobre as estratégias adotadas para avaliação da estrutura
fatorial de instrumentos psicométricos utilizando como exemplo os modelos fatoriais
do Body Shape Questionnaire (BSQ). Métodos: Foram avaliados sete modelos fatoriais diferentes
do BSQ, que foram obtidos por meio de análise fatorial exploratória (AFE) e estão
apresentados na literatura. A análise fatorial confirmatória desses modelos foi realizada para
a amostra de estudo utilizando-se aos índices qui-quadrado pelos graus de liberdade (c2/gl),
Comparative Fit Index (CFI), Tucker-Lewis index (TLI), Root Mean Square Error of Approximation
(RMSEA) e Weighted Root Mean Square Residual (WRMR). As validades convergente e discriminante
foram avaliadas a partir da variância extraída média e do coeficiente de determinação
entre os fatores do BSQ, respectivamente. A confiabilidade dos modelos foi avaliada a partir
da confiabilidade composta e do coeficiente alfa de Cronbach. Resultados: Participaram
739 universitárias com média de idade de 20,4 (desvio-padrão = 2,4) anos. Todos os modelos
apresentaram adequado ajustamento para a amostra de estudo, contudo a validade discriminante
esteve comprometida neles. A confiabilidade dos modelos também foi adequada.
Conclusão: Apesar de todos os modelos testados do BSQ apresentarem bons indicadores
psicométricos, salienta-se que eles foram obtidos em amostras diferentes utilizando-se AFE
e sem justificativa teórica plausível para a construção dos fatores, o que pode dificultar a
escolha de um modelo para utilização em ambiente clínico. Assim, diante da importância
de preservação do conceito teórico durante o desenvolvimento do instrumento, sugere-se cautela na utilização de modelos sem sustentação teórica.
ABSTRACT: 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 (c2/df), Comparative Fit Index (CFI), Tucker-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.
ABSTRACT: 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 (c2/df), Comparative Fit Index (CFI), Tucker-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.
Description
Keywords
Análise fatorial Instrumentos Validação Imagem corporal Factor analysis Instruments Validation Body image
Citation
Jornal Brasileiro de Psiquiatria, 67(3), 201-207 Doi: 10.1590/0047-2085000000205
Publisher
ECN - Editora Cientifica Nacional Ltda.