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The clinician administered staging instrument for anorexia nervosa: Development and psychometric properties
Author(s) -
Maguire Sarah,
Touyz Stephen,
Surgenor Lois,
Crosby Ross D.,
Engel Scott G.,
Lacey Hubert,
HeywoodEverett Suzanne,
Le Grange Daniel
Publication year - 2012
Publication title -
international journal of eating disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.785
H-Index - 138
eISSN - 1098-108X
pISSN - 0276-3478
DOI - 10.1002/eat.20951
Subject(s) - anorexia nervosa , psychology , discriminant validity , psychometrics , inter rater reliability , clinical psychology , test validity , reliability (semiconductor) , convergent validity , concurrent validity , internal consistency , psychiatry , eating disorders , developmental psychology , rating scale , power (physics) , physics , quantum mechanics
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. © 2011 by Wiley Periodicals, Inc. (Int J Eat Disord 2012)