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Seasonal patterns of birth for subjects with bulimia nervosa, binge eating, and purging: Results from the National Women's Study

Authors

  • Timothy D. Brewerton MD,

    Corresponding author
    1. Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, South Carolina
    • Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, South Carolina
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  • Bonnie S. Dansky PhD,

    1. Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, South Carolina
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  • Patrick M. O'Neil PhD,

    1. Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, South Carolina
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  • Dean G. Kilpatrick PhD

    1. Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, South Carolina
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  • Parts of this manuscript were presented as paper presentations at the Annual Meeting of the Academy of Eating Disorders, Barcelona, Spain, June 2006 and Baltimore, MD, May 2007.

Abstract

Objective:

Studies of birth patterns in anorexia nervosa have shown relative increases between March and August, while studies in Bulimia Nervosa (BN) have been negative. Since there are no studies using representative, nonclinical samples, we looked for seasonal birth patterns in women with BN and in those who ever endorsed bingeing or purging.

Method:

A national, representative sample of 3,006 adult women completed structured telephone interviews including screenings for bulimia nervosa (BN) and questions about month, date, and year of birth. Season of birth was calculated using traditional definitions. Differences across season of birth between subjects with (n = 85) and without BN (n = 2,898), those with (n = 749) and without bingeing (n = 2,229), and those with (n = 267) and without any purging (n = 2,715) were compared using chi-square analyses.

Results:

There were significant differences across season of birth between subjects: (1) with and without BN (p = 0.033); (2) with and without bingeing (p = 0.034), and; (3) with and without purging (p = 0.001). Fall had the highest relative number of births for all categories, while spring had the lowest.

Discussion:

In a national representative study of nontreatment seeking subjects significant differences in season of birth were found for subjects with lifetime histories of BN, binge eating and purging. © 2011 by Wiley Periodicals, Inc. (Int J Eat Disord 2012)

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