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Updated: May 24, 2026

A Computer-Based Platform for Aiding Clinicians in Eating Disorder Analysis and Diagnosis
Published on: May 10, 2022
The clinician administered staging instrument for anorexia nervosa: development and psychometric properties
Sarah Maguire1, Stephen Touyz, Lois Surgenor
1School of Psychology, University of Sydney, Sydney, Australia. sarah.maguire@email.cs.nsw.gov.au
Objective:
To develop and evaluate an instrument to assess severity in anorexia nervosa (AN), the Clinician Administered Staging Instrument for Anorexia Nervosa (CASIAN).
Method:
Candidate items for the CASIAN were developed in three phases (domain, content, and item generation) followed by a pilot study. The psychometric properties of the resultant 34-item questionnaire were investigated in cross-sectional and longitudinal samples (N = 171) with DSM-IV AN and subthreshold AN.
Results:
Item and factor analysis procedures resulted in a refined 23-item CASIAN comprising of six factors ("Motivation," "Weight," "Illness Duration," "Obsessionality," "Bulimic Behaviors," and "Acute Issues"). The CASIAN had high internal consistency (.811), test-retest (.957), and interrater reliability (.973). Preliminary support for the convergent, discriminant, concurrent, and predictive validity of the CASIAN was found.
Discussion:
The CASIAN is a psychometrically sound instrument. Further studies are needed to confirm the factor structure and assess its clinical and research utility.
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