The participants of this study were recruited within a prospective, observational longitudinal investigation that aimed at evaluating the inpatient treatment concept for adolescents with AN (described in detail below 2.2) at the Eating Disorders Unit of the Department of Child and Adolescent Psychiatry at the Medical University Hospital of Vienna. This study was conducted between 2007 and 2019. All adolescent patients aged between 11 and 17 years, with a definite diagnosis of AN according to the 10th revision of the International Statistical Classification of Diseases and Related Health Problems [88] with a BMI below 17.5 kg/m2 (AN restrictive type F50.00, AN binge-purging type F50.01), who were admitted to the Eating Disorders Unit during this period were eligible for inclusion.

Patients as well as their parents gave written informed consent. Ethical approval for this study was granted by the Ethics Committee of the Medical University of Vienna (EK493/07; 09.10.2007).

In total, 145 adolescents were approached, of whom 11 patients declined to participate. Male patients (n = 5) and patients suffering from atypical AN (n = 3) were excluded. Thus, the final sample comprises 126 female adolescents with AN who underwent the Viennese Treatment—Concept for Adolescents Suffering Anorexia Nervosa (‘ViTAA’) during their inpatient treatment. The patients completed a standardized assessment of clinical parameters, set of questionnaires, and clinical interviews (see below) at admission (T0) and at discharge (T1). Figure 1 presents the participants’ flow.

Participants’ flow.

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