Self-efficacy for weight loss: questionnaire and criteria validation to guide the care of individuals with obesity in the SUS

Abstract Objective To translate, cross-culturally adapt, and validate a questionnaire measuring self-efficacy for weight loss and to validate criteria to guide the care flow of individuals with obesity. Methods A questionnaire, originally in English, was translated into Portuguese and cross-culturally adapted for use in the Sistema Único de Saúde using a sequential approach. Experts and health professionals assessed the content and comprehensibility of items, respectively. Individuals with obesity answered the translated and adapted questionnaire as well as questions about stages of change, sociodemographic characteristics, and nutritional status. The criteria validity was performed using sensitivity analysis. Results One item was excluded, and three were changed for better clarity and adequacy with a reduction in response options. The questionnaire had high specificity (85%) to identify individuals in ‘pre-action’ who were not confident about weight loss. Conclusion The questionnaire was valid for use in the SUS with the potential to improve the care offered to individuals with obesity.