Furthermore, it is claimed that the factor structure of the EDI-3 captures important clinical aspects of the psychopathology of eating disorders yet at present, no independent test of this factor structure has been conducted. Since 2004 many studies have used the new EDI-3 version, yet the present study is to our knowledge the first one to independently test the factor structure, the internal consistency as well as discriminative and cross-cultural validity. The EDI-3 revision yields adequate convergent and discriminant validity (Cumella 2006). This generally increases the variance of item scores, and possibly changes the covariance between items. Moreover, the new version uses the six-choice format of the EDI-2, but scores were recalibrated from a 0–3 to a 0–4 format to expand the range of summative scores to improve the psychometric properties with non-clinical populations. Also, three response style indicators have been added (Garner 2004). Thus the EDI-3 consists of the more general, though eating disorder relevant psychological trait subscales low self-esteem (LSE), personal alienation (PA), interpersonal insecurity (II), interpersonal alienation (IA), interoceptive deficits (ID), emotional dysregulation (ED), perfectionism (P), asceticism (AS) and maturity fear (MF).
1988) new factor analyses of the sum scores yielded new subscales more congruent with recent theory and research on eating disorders (Garner 2004). Based on criticism regarding the factor structure of the EDI-2 (Limbert 2004 Muro-Sans et al. The reliability of these index scores collected from eating disorder patients appears excellent (Cronbach’s α = .90–.97 test–retest r = .98) (Garner 2004 Wildes et al. It consists of the same 91 questions as the EDI-2, including the same three subscales of eating disorder symptoms. The EDI-3 represents an expansion and improvement of the earlier versions of the EDI. Both the original and the second version (EDI-2) have been used worldwide to screen for eating disorders in the general population, to measure treatment effect and outcome, as well as in routine clinical evaluations. 2009), which often manifest itself as a lack of psychometric measurement invariance across cultures. However, cross-cultural differences have been detected (e.g., Waldherr et al. The EDI-2 discriminates reliably between patients and non clinical controls, and to some degree between patient groups (Garner 1991 Lee et al. In 1991, the EDI was enlarged from 64 to 91 items to measure additional general features related to asceticism (AS), impulse regulation (IR) and social insecurity (SI) (Garner 1991). The original version of the EDI was developed in 1983 by Garner, Olmsted, and Polivy comprising three subscales measuring eating disorder symptoms, i.e., drive for thinness (DT), bulimia (B) and body dissatisfaction (BD), and five more general psychological features related to eating disorders, i.e., ineffectiveness (IN), perfectionism (PE), interpersonal distrust (ID), interoceptive awareness (IA) and maturity fears (MF). The Eating Disorder Inventory (EDI) is a self-report questionnaire widely used both in research and in clinical settings to assess the symptoms and psychological features of eating disorders.