How can we improve dissemination of universal eating disorder risk reduction programs?

Prevention of eating disorders-Efficacy and cost-benefit of a school-based program ("MaiStep") in a randomized controlled trial (RCT)

OBJECTIVE

Given the severity of eating disorders, effective and easily implementable prevention programs which reduce incidence rates and in addition have health-economic benefits are essential. The majority of research on prevention programs focuses on questionnaire-based efficacy or the reduction of eating disorder symptoms while neglecting the health-economic perspective. By contrast, the present study focuses on both an efficacy analysis considering diagnostic criteria (DSM-5) and on evaluating the cost-benefit of a universal prevention program for eating disorders ("MaiStep").

METHOD

A three-arm randomized controlled trial with baseline, posttreatment and 12-month follow-up was conducted with 1,654 adolescents (M = 13.35, SD = 0.76), comprising two intervention groups (MaiStep delivered by psychologists or teachers, IG-T) and an active control group (ACG). The primary outcome was DSM-5 eating disorder diagnosis measured with the SIAB-S. Furthermore, the costs of the prevention program and the savings in health care costs were calculated.

RESULTS

A significant difference in eating disorder diagnosis was found between the IG-T and the ACG for posttreatment (χ² (1= 7.352, p = .007), Relative Risk (RR) = .53 and 12-month follow-up (χ² (1= 5.203, p = .023), RR = .61. MaiStep proved to be cost-effective (t_cbr  = 6.75), saving about 560,000 € (standardized per 1,000 students = 601,388.19 €).

DISCUSSION

Universal prevention can both reduce incidence rates of eating disorders and be cost-beneficial for health care systems. Future research should analyze prevention programs regarding efficacy and cost-benefit to enable comparability and derive guidelines for political decision-makers.

TRIAL REGISTRATION NUMBER

MaiStep is registered at the German Clinical Trials Register (DRKS00005050).

The healthy body image (HBI) intervention: Effects of a school-based cluster-randomized controlled trial with 12-months follow-up

We examined the effects of the Healthy Body Image (HBI) intervention on positive embodiment and health-related quality of life among Norwegian high school students. The intervention comprised three interactive workshops, with body image, media literacy, and lifestyle as main themes. In total, 2,446 12^th grade boys (43%) and girls (mean age 16.8 years) from 30 high schools participated in a cluster-randomized controlled study with the HBI intervention and a control condition as the study arms. Data were collected at baseline, post-intervention, 3- and 12-months follow-up, and analysed using linear mixed regression models. The HBI intervention caused a favourable immediate change in positive embodiment and health-related quality of life among intervention girls, which was maintained at follow-up. Among intervention boys, however, weak post-intervention effects on embodiment and health-related quality of life vanished at the follow-ups. Future studies should address steps to make the HBI intervention more relevant for boys as well as determine whether the number of workshops or themes may be shortened to ease implementation and to enhance intervention effects.

Treating eating disorders in the real world - MaiStep: A skill-based universal prevention for schools

Eating disorders are difficult to treat and often associated with morbidity and mortality. Universal prevention approaches are increasingly focusing on enhancing skills, but few eating disorder programs are available for under-15-year-olds. This study aimed to develop and examine a school-based universal prevention program ('MaiStep') for adolescent boys and girls. A three-arm randomized controlled trial with baseline, post-intervention and 12-month follow-up was conducted with 1654 adolescents (M = 13.35, SD 0.76). 'MaiStep' was delivered by psychologists in the first intervention group (IG1) and teachers in the second intervention group (IG2), and compared to an active control group (ACG). Primary outcomes were eating disorder-related risk factors measured with scales of the Eating Disorder Inventory-2 (e.g. 'drive for thinness', 'interoceptive awareness'), cognitions and affect related to the body (Body Shape Questionnaire, BSQ-8), and behaviors (Body Image Avoidance Questionnaire, BIAQ). The total sample (N1) was divided into a healthy subsample (N2) and a sample fulfilling DSM-5 criteria for a subthreshold eating disorder (N3) measured with the self-report Structured Inventory for Anorexic and Bulimic Syndromes (SIAB-S). Significant improvements in 'interoceptive awareness' (EDI-2) and lower BIAQ scores emerged in N1 at post-intervention and at 12-month follow-up (F(4; 3038) = 3.068, p = .016, η_part² = 0.004 and F(4; 2900) = 2.993, p = .018, η_part² = 0.004) and in N2 at post-intervention and at 12-month follow-up (F(4; 2812) = 3.147, p = .014, η_part² = 0.004 and F(4; 2684) = 3.674, p = .005, η_part² = 0.005). The healthy subsample N2 additionally showed significantly lower scores on 'drive for thinness' (EDI-2) and on the BSQ-8c at post-intervention (F(2; 1446) = 3.091, p = .046, η_part² = 0.004 and F(2; 1453) = 3.505, p = .030, η_part² = 0.005) but not at 12-month follow-up. No significant results emerged for N3. The positive findings of improved 'interoceptive awareness' (EDI-2) and reduced body image avoidance (BIAQ) indicate that broad disseminated universal prevention under the age of 15 is possible. Trial registration MaiStep is registered at the German Clinical Trials Register (DRKS00005050).

Efficacy of a prevention program for eating disorders in schools: a cluster-randomized controlled trial

BACKGROUND

Previous prevention programs in the school context have not addressed both genders, have been time-consuming, or have had deficits in the evaluation method. The aim of the present study was to evaluate the impact of a universal prevention program for female and male adolescents on eating disorder pathology and related risk factors.

METHODS

Between February 2012 and July 2014, 2515 students in 23 schools from 8th or 11th grade were assessed for eligibility in this longitudinal cluster-randomized controlled trial with a six months follow-up. Of those students, 2342 were cluster-randomized to the intervention condition which received a six school hours universal prevention program or to the no treatment control condition.

RESULTS

The complete case population comprised 724 students in the intervention (54.3% female, M = 14.3 years, SD = 1.61) and 728 in the control condition (57.0% female, M = 14.7 years, SD = 1.63). Random-effects analysis of covariance on the primary outcome showed no significant differences between the intervention and control groups in their eating disorder pathology change scores six months after the intervention. Regarding secondary outcomes, participants in the intervention group showed a greater increase in knowledge about eating disorders both after the intervention (p < .001, ES = 1.06) and six months later (p = .01, ES = 0.40). Greater reductions in anxiety severity were observed in the intervention group post-intervention (p = .02, ES = 0.22) which was not maintained at the six months follow-up. Results differed between participants from grade 8 and 11.

CONCLUSION

The present universal prevention program can be particularly recommended for adolescents from grade 11.

TRIAL REGISTRATION

ISRCTN 97989348.