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Table 1 Overview of questionnaire measures used in the sample. For more detailed information of each of the instruments please refer to the Supplementary Material (1.3.1–1.3.20, Additional file 1

From: Study protocol of comprehensive risk evaluation for anorexia nervosa in twins (CREAT): a study of discordant monozygotic twins with anorexia nervosa

Questionnaire Measure
MiniMeal-Questionnaire General diet behaviors
Impulsive Behavior Scale (SUPPS-P) Impulsivity
Active-Questionnaire (Active-Q) Physical activity
Eating Disorder Examination - Questionnaire (EDE-Q) Disordered eating behavior
Quality of Life Inventory (QOLI) Quality of life
Nicotine Dependency Scale Nicotine dependence
Hormonal, Menstrual and Reproductive History (HMRH) Reproductive history
Perception of Teasing Scale (POTS) Weight and competency teasing
Edinburgh Handedness Inventory Handedness
Behavioral Inhibition/Approach System (BIS/BAS) Behavioral inhibition and approach tendencies
Multidimensional Perfectionism Scale (MPS) Perfectionism
Patient Health Questionnaire (PHQ9) Depression
Generalized Anxiety Disorder (GAD-7) Severity of anxiety disorder
Autism Spectrum Quotient (AQ-10) Position on the autism-normality continuum
Obsessive Compulsive Inventory – Revised (OCI-R) Compulsive behaviour
Big Five Inventory (BFI) Extraversion, agreeableness, consciousness, neuroticism, openness
Online 24-Hour Recall Log Book Nutrition intake
Visual Analogue Scale (VAS) Hunger and thirst
Positive and Negative Affect Schedule (PANAS) Positive and negative affect
Stool and Medication Questionnaire Gastrointestinal symptoms and medication intake