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Shape and weight concern as a moderator of program outcomes from the Prevention Across the Spectrum RCT

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Objective

To investigate if baseline shape and weight concern moderated outcomes in the Prevention Across the Spectrum trial, a randomised-controlled trial (RCT) of 3 school-based programs aimed at reducing eating disorder and obesity risk factors.

Method

N = 1,316 Grade 7 and 8 girls and boys (M age = 13.21 years) across three Australian states were randomly allocated to: Media Smart; Life Smart; Helping, Encouraging, Listening and Protecting Peers Initiative (HELPP) or control (usual school class). Risk factors were measured at baseline, post-program (5-weeks later), and 6- and 12-month follow-up.

Results

Moderation was indicated by significant interaction effects for group (Media Smart; Life Smart; HELPP; Control) X moderator (high shape and weight concern; low shape and weight concern) X time (post-program; 6-month follow-up; 12-month follow-up), with baseline entered as a covariate. Such effects were found for shape concern, weight concern, eating concern, regular eating, body dissatisfaction, and physical activity. Post-hoc testing found Media Smart participants with high baseline shape and weight concern experienced a reduction in risk at 12-month follow-up for 4 of the 6 variables.

Discussion

This study shows it is possible for a school-based program to reduce eating disorder risk factors in participants with high baseline risk of an eating disorder.

Author information

Correspondence to Simon Wilksch.

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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Wilksch, S., Wade, T., Paxton, S. et al. Shape and weight concern as a moderator of program outcomes from the Prevention Across the Spectrum RCT. J Eat Disord 3, O28 (2015) doi:10.1186/2050-2974-3-S1-O28

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Keywords

  • Eating Disorder
  • High Baseline
  • Body Dissatisfaction
  • Obesity Risk
  • Weight Concern