Clinician-led, peer-led, and internet-delivered dissonance-based eating disorder prevention programs: Effectiveness of these delivery modalities through 4-year follow-up.

Abstract

Independent trials have found that the dissonance-based Body Project eating disorder prevention program is efficacious and effective; the present trial provided the first test of whether delivery could be task-shifted from clinician-delivery to peer educator-delivery or Internet-delivery without loss of effectiveness through 4-year follow-up. Young women at high-risk for eating disorders because of body image concerns (N = 680, Mage = 22.2) recruited at 3 colleges were randomized to clinician-led Body Project groups, peer-led Body Project groups, the Internet-based eBody Project, or educational video control. Participants in clinician- and peer-led Body Project groups and the eBody Project generally showed larger reductions in risk factors and eating disorder symptoms versus controls through 1- and 2-year follow-up (d = .16-.59), with some effects persisting through 3- and 4-year follow-ups (d = .28-.58). Peer-led Body Project participants showed greater reductions in some risk factors than eBody Project participants (d = .18-.19), but no other contrasts between Body Project interventions differed. Eating disorder onset over 4-year follow-up was significantly lower for peer-led Body Project participants (8.1%) than control participants (17.6%) and clinician-led Body Project participants (19.3%), and marginally lower than eBody Project participants (15.5%). The evidence that all three Body Project interventions outperformed educational video controls, peer-led groups outperformed the Internet-based intervention, and peer-led groups showed lower eating disorder onset over 4-year follow-up than the other conditions are novel. Results imply that it might be optimal to task-shift Body Project delivery to peer-leaders to address implementation barriers associated with clinician-led delivery. (PsycInfo Database Record (c) 2020 APA, all rights reserved).