Psychometric Properties of the Self-efficacy Scale for a Healthy Diet in Individuals with Obesity
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Abstract
Objective. The purpose of this study was to develop an instrument to measure self-efficacy for a healthy diet in Mexican population with obesity and the evaluation of the psychometric properties of the Self-Efficacy Scale for a Healthy Diet (SSHD).
Method. The sample included 202 participants receiving care in public obesity clinics. The SSHD applied is a Likert-type scale developed from the Health Action Process Approach containing 45 items. Omega coefficient and Confirmatory Factor Analyses were estimated to evaluate the psychometric properties.
Results. The scale has good measures of goodness of fit χ2 = 66.49; p < .001; χ2 SB/gl = 41; CFIS = .955; NFI = .893; RMSEAS = .056 (95% CI [.029, .079]) and total scale reliability of ω = .896 (CI 95% [.876, .915]).
Discussion and conclusion. The SSHD is a reliable, valid instrument for measuring the three types of self-efficacies proposed in HAPA in people with obesity who require changes to adhere to a healthier diet.
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