Comparing definitions of purging disorder on point prevalence and associations with external validators
Article first published online: 17 JUN 2009
Copyright © 2009 Wiley Periodicals, Inc.
International Journal of Eating Disorders
Volume 43, Issue 5, pages 433–439, July 2010
How to Cite
Haedt, A. A. and Keel, P. K. (2010), Comparing definitions of purging disorder on point prevalence and associations with external validators. Int. J. Eat. Disord., 43: 433–439. doi: 10.1002/eat.20712
- Issue published online: 1 JUN 2010
- Article first published online: 17 JUN 2009
- Manuscript Accepted: 30 APR 2009
- National Institute of Mental Health. Grant Number: R01 63758
- purging disorder;
- diagnostic validity;
We varied two defining features of Purging Disorder (PD): breadth of “purging” behaviors (purging only [narrow] vs. purging and nonpurging [broad]) and minimum behavioral frequency (once vs. twice per week) to examine their impact on syndrome validity.
Survey data from 1736 women and 755 men were used for analyses.
PD point prevalence was higher in women versus men, and prevalence was lowest for the narrow definition requiring purging twice per week. The narrow definition was associated with significant psychosocial impairment and increased effect sizes in validation analyses. Changing minimum behavioral frequencies did not impact associations with external validators.
A broad definition of PD that included any compensatory behavior reduced distinctions between PD and normality. Reducing minimum frequency to once per week did not reduce homogeneity or evidence of syndrome severity. Purging once per week may represent the optimal starting point in defining the central behavioral feature of PD. © 2009 by Wiley Periodicals, Inc. Int J Eat Disord 2010