2.3.1. EDE & EDE-Q

The Eating Disorder Examination Interview (EDE) [89] is a semi-structured, investigator-based interview that assesses eating disorder psychopathology. This interview is regarded as the gold-standard of eating disorder assessment worldwide. The Eating Disorder Examination- Questionnaire (EDE-Q) [90] is the corresponding self-report instrument. Both instruments include the same 22 items assessing core symptoms of eating disorders, which are rated on a 7-point Likert-scale from 0–6. Item ratings are summed up to four subscales (Restraint Scale, Eating Concern Scale, Weight Concern Scale, Shape Concern Scale) and a global score. We included both the EDE and EDE-Q, as previous studies have shown that clinician rating and self-reports sometimes diverge although correlations between these measures may be high [49,50] probably because adolescents with eating disorders tend to deny or understate their symptoms. Thus, including both perspectives will help to evaluate whether the treatment is equally effective from the clinician’s and patient’s point of view.