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The Anorectic Behavior Observation Scale is a thirty-item diagnostic questionnaire devised to be answered by the parents, spouse or other family member of an individual suspected of having an eating disorder. It was developed by Vandereyken et al. in 1992. The ABOS is useful for evaluations of patients with anorexia nervosa and bulimia nervosa before, during, and after clinical treatments. It can also be a significant tool for the screening of subjects in early-stage ED.
The validity and reliability of the ABOS have been confirmed by Vandereycken, and the scale shows good internal consistency with Cronbach's α of.81.
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