Introduction
anorexia nervosa, low-weight eating disorders, anxiety
REMISSION
Therapist fidelity measures are intended to examine the degree of adherence to an intervention and are essential to ensure that evidence-based treatments are delivered as intended. Adherence to treatment refers to the extent to which a therapist delivers the intervention with integrity and according to the procedures outlined by the manual [Family-based therapy (FBT) is the leading evidenced based treatment for adolescents with anorexia nervosa (AN). However, not all patients recover using this treatment with low sustained remission rates (e.g. 41%; [Our novel six-session FBT-IE treatment is based on the ‘broad anxiety’ model of AN [We developed a treatment manual outlining the six intervention sessions, which the therapists reviewed and followed for the research study. In conjunction, we developed an Adherence Coding Framework (See Thus, the aim of this paper is to describe the development and psychometric validation of a treatment fidelity instrument, the IE-ACF, for adolescents with low-weight eating disorders. Data for this study were collected from an ongoing randomized controlled trial testing a short form of FBT-IE based on the ‘broad anxiety’ model of AN [