Effectiveness of peer-led dissonance-based eating disorder prevention groups: Results from two randomized pilot trials

ObjectiveThe present preliminary trials tested whether undergraduate peer leaders can effectively deliver a dissonance-based eating disorder prevention program, which could facilitate broad dissemination of this efficacious intervention.MethodIn Study 1, female undergraduates (N = 171) were randomized to peer-led groups, clinician-led groups, or an educational brochure control condition. In Study 2, which improved a design limitation of Study 1 by using completely parallel outcome measures across conditions, female undergraduates (N = 148) were randomized to either immediate peer-led groups or a waitlist control condition.ResultsIn Study 1, participants in peer- and clinician-led groups showed significantly greater pre–post reductions in risk factors and eating disorder symptoms than controls (M d = .64 and .98 respectively), though clinician- versus peer-led groups had higher attendance and competence ratings, and produced stronger effects at posttest (M d = .32) and at 1-year follow-up (M d = .26). In Study 2, participants in peer-led groups showed greater pre–post reductions in all outcomes than waitlist controls (M d = .75).ConclusionsResults provide novel evidence that dissonance-based eating disorder prevention groups led by undergraduate peers are feasible and produce greater reductions in eating disorder risk factors and symptoms than minimal-intervention control conditions, but indicate that effects are smaller for peer- versus clinician-led groups.

► We tested effectiveness of peer-led dissonance-based eating disorder prevention program.
► Compared effectiveness of peer- and clinician-led groups to control conditions.
► Peer- and clinician-led groups showed greater reductions in all outcomes than controls.
► Clinician- versus peer-led groups showed greater reductions in certain outcomes.