Evaluation of a Digital School-Based Intervention for the Primary Prevention of Eating Disorders in Pre-Adolescents (PRETA Program)

The ChEAT is an adaptation of the EAT-26 for children is a 26 items scored on a 6-option Likert scale. It is a validated, self-administered questionnaire in Spanish for children aged 8 and older, with a reading level of 5th grade. The questionnaire focuses on identifying issues related to a persistent concern with food, eating patterns, and abnormal attitudes for this age group. The total score is obtained by summing all items, resulting in a range from 0 to 78 points. A total score above 20 points may indicate a possible presence of ED

It consists of 9 male and 9 female figure outlines that increase in size as the score increases. This scale measures the level of satisfaction with one's own body image. The degree of satisfaction or discrepancy index is obtained by calculating the difference between the desired and perceived images. A difference of 2 points is associated with body image disturbance. Age-appropriate images adapted for children aged 10 to 13 years will be used.

The Eating Disorders Inventory-2 is a self-report instrument consisting of 91 items assessing psychological and behavioral traits associated with eating disorders, primarily anorexia and bulimia nervosa, across 11 different subscales. The response scale is a six-point Likert scale ranging from 0 (never) to 5 (always). The total score is obtained by summing all responses; a higher score indicates a greater presence of the trait.

The original instrument includes 5 subscales; however, in this study, only the subscales related to body image internalization will be applied: the current aesthetic model based on thinness and the current aesthetic model based on athletic build (10 items), and the pressure to meet beauty ideals promoted by the media (4 items). Items are answered on a 5-point Likert scale, ranging from 1 "completely disagree" to 5 "completely agree." The score is calculated by summing all items; a higher score indicates greater internalization and influence of the aesthetic body model.

consists of 10 items that assess global self-esteem in adolescents, including elements focused on feelings of self-respect and self-acceptance. The first 5 items are positively worded and scored from 4 (strongly agree) to 1 (strongly disagree); the last 5 items are negatively worded and scored from 1 (strongly agree) to 4 (strongly disagree). The total score is obtained by summing all item responses. A score above 30 indicates high self-esteem, a score between 26 and 29 is considered medium self-esteem, and a score below 25 reflects low self-esteem.