Table 1 Eligibility criteria for included studies

Study design

RCTs, prospective cohort studies, retrospective cohort studies, cross-sectional and case-control studies.

Age

Children and adolescents < 18 y.o.

Young adult 18–24 y.o.

Gender

All gender

Diagnosis

Meeting criteria for Anorexia Nervosa based on DSM-5, DSMIV-R or ICD-10

Severity of disease

Severe malnutrition (BMI < 16 kg/m² (adult) or percent median BMI ≤70% or Z-score ≤ − 3 SD (adolescents))

OR

Moderate malnutrition (BMI 16–16.99 kg/m² (adult) or percent median BMI 70–79% or Z-score − 2 to − 2.9 SD (adolescents)) AND Acute medical instability at admission

Admission

First and repeated admissions as long all episodes documented separately and other inclusion criteria are met

Interventions

Defining at least one the following element of an inpatient admission protocol intended for AYAs with AN:

-Refeeding plan

-Laboratory surveillance

-Cardio-respiratory stability monitoring

-Supplementation