Shared and unique risk factors between lifetime purging and objective binge eating: A twin study

Wade, T. D., Treloar, S. and Martin, N. G. (2008) Shared and unique risk factors between lifetime purging and objective binge eating: A twin study. Psychological Medicine, 38 10: 1455-1464. doi:10.1017/S0033291708002791


Author Wade, T. D.
Treloar, S.
Martin, N. G.
Title Shared and unique risk factors between lifetime purging and objective binge eating: A twin study
Journal name Psychological Medicine   Check publisher's open access policy
ISSN 0033-2917
1469-8978
Publication date 2008-10
Sub-type Article (original research)
DOI 10.1017/S0033291708002791
Volume 38
Issue 10
Start page 1455
End page 1464
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher Cambridge University Press
Language eng
Formatted abstract
Background: Objective binge eating (OBE) and self-induced vomiting (SIV) occur and co-occur across a range of eating disorders but the extent to which the risk factors for these two behaviours overlap is unclear. Examination of this overlap was the focus of the current report.

Method: A population of female Australian twins (n=1002), mean age 35 years  (S.D.=2.11, range 28–40), participated in three waves of data collection and were assessed for lifetime disordered eating with a semi-structured interview at wave 3 and a self-report questionnaire at wave 1 ; risk factors were assessed via self-report at waves 1 and 3.

Results: Non-shared environmental influences were the largest contributor to the variance of both OBE and SIV, with a more modest contribution of genetic influences. Between 5% and 14% of the environmental risk factors for OBE and SIV were shared and 27–100% of genetic risk factors were shared. SIV initiation was predicted by higher neuroticism and novelty seeking and lower maternal and paternal care, whilst lower levels of perceived paternal care, higher lifetime BMI, and a wider BMI range predicted OBE initiation. Retrospective correlates associated with both SIV and OBE onset were parental comments about weight, whilst higher levels of parental conflict, expectations and criticism was associated with OBE onset only.

Conclusions: The substantial extent of non-overlap between risk factors for SIV and OBE suggests that each of these behavioural disturbances warrants future investigation in its own right, not only when they occur in conjunction with each other.
Keyword Objective binge eating
Prospective risk factors
Self-induced vomiting
Twins
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes First published online 29 January 2008

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Medicine Publications
 
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Created: Thu, 03 Sep 2009, 09:26:36 EST by Mr Andrew Martlew on behalf of Queensland Institute of Medical Research