The development and validation of the Body Image Dimensional Assessment (BIDA)

AIM: To validate a silhouette-based scale, the Body Image Dimensional Assessment (BIDA), an instrument for the screening of body dissatisfaction in large samples. MATERIALS AND METHODS: Five-hundred ninety-two both gender non-clinical participants and 57 patients with eating disorders (ED) were administered the BIDA and the Body Dissatisfaction subscale of the Eating Disorder Inventory 2 (BD-EDI2). The BIDA consists of only 4 items to answer with reference to a series of four silhouettes not age- nor gender-related using a numeric scale that allows the quantification of the degree of Body Dissatisfaction, Sexual Body Dissatisfaction, Comparative Body Dissatisfaction and the calculation of the final Body Dissatisfaction Index (BDI). RESULTS AND CONCLUSIONS: The study has shown that the BIDA has good reliability and validity as well as high predictive capability at a threshold BDI?30 (sensitivity =83.3% and specificity =92.1%). By virtue of the rapid timing of administration, the BIDA can be a useful screening instrument of body dissatisfaction in non clinical populations to detect people at risk for ED and a follow-up instrument in clinical setting