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Establishing valid and reliable methods for assessing social cognitive measures of dietary behaviors support the design and delivery of more effective interventions. The aims of this study were to culturally adapt social cognitive measures related to adolescent dietary behaviors and evaluate the reliability and factorial validity of these measures in Brazilian adolescents. The instrument was culturally adapted from an Australian questionnaire based on the Banduras' Social Cognitive Theory, and it included the following constructs: self-efficacy, intentions, situation, social support, behavioral strategies, and outcome expectations and expectancies. The questionnaire was administered in a two-week test-retest with 173 adolescents (M=15.3±1.53 years old). A confirmatory factor analysis was employed to examine model-fit for each scale using multiple indices including: chi-square, comparative-fit, goodness-of-fit, and root mean square error of approximation. Reliability properties were also examined. The reliability and factorial validity are appropriate, suggesting for each scale values between adequate to exact; internal consistency from acceptable to excellent (α=0.66 to 0.94); and rank order repeatability from adequate to strong (ICC=0.65–0.93). The Brazilian version showed appropriate internal consistency, factorial validity and test-retest reliability, and will be useful to assess social cognitive dietary behaviors among Brazilian adolescents.

Cultural adaptation and psychometric properties of social cognitive scales related to adolescent dietary behaviors