Adaptation of the Spanish version of the Self-Efficacy Consumption of Fruit and Vegetables Scale

Abstract

The objective of this study was to analyse the psychometric properties of the Spanish version of the Self-Efficacy Consumption of Fruit and Vegetables Scale among the Spanish population. The sample was made up of 506 subjects who were selected through a convenience sample. The original version was translated from English to Spanish and later was translated back into English, by different translators. Upon translating, not only did the translators keep in mind the grammatical and linguistic aspects of the text, but also the cultural aspects. In order to validate the content of the Scales, the adapted and agreed-upon version of the scale was evaluated by a panel of experts, in order to obtain the final version. Data collection took place between March and September 2017.The internal consistency was tested using Chronbach’s alpha. For the analysis of the structural validity, a factor analysis was carried out on the Self-Efficacy Consumption of Fruit and Vegetables Scale-Spanish version. Kaiser-Meyer Olkin and Bartlett’s test of sphericity (0.90) confirmed that the analysis was suitable. A two-factor structure was confirmed, as in the original scale. The value of Chronbach’s α for the total questionnaire was 0.877, which shows a good internal consistency. In the analysis of the reliability test-retest, a correlation value of 0.79 (p<0.05) was found, demonstrating its temporal stability. The Self-Efficacy Consumption of Fruit and Vegetables questionnaire is a reliable tool to measure self-efficacy in the consumption of fruits and vegetables in the Spanish context.