Tiffany Melioli1, Stephanie Bauer2, Debra L Franko3, Markus Moessner2, Fikret Ozer2, Henri Chabrol1, Rachel F Rodgers3,4. 1. Octogone-Centre D'étude Et De Recherche En Psychopathologie, Université Toulouse II, 5 Allée Antonio Machado, 31058, Toulouse Cedex 9, France. 2. Center for Psychotherapy Research, University Hospital Heidelberg, Bergheimerstr. 54, Heidelberg, 69115, Germany. 3. Department of Counseling and Applied Educational Psychology, Northeastern University, Boston, Massachusetts. 4. Laboratoire Du Stress Traumatique (EA 4560), Université Toulouse-III Paul Sabatier, Toulouse, 31400, France.
Abstract
OBJECTIVE: The purpose of this meta-analytic review was, first, to evaluate the efficacy of Internet-based programs in decreasing eating disorder (ED) symptoms, and, second, to identify moderator variables these effects. METHOD: Twenty studies were identified and between-group effect sizes were calculated for ED symptoms and risk factors. RESULTS: Compared with control conditions, Internet-based programs successfully decreased body dissatisfaction (d = 0.28, 95% CI [0.15-0.41], p < .001), internalization of the thin ideal (d = 0.36, 95% CI [0.07-0.65], p < .05), shape and weight concern (d = 0.42, 95% CI [0.13-0.71], p < .05), dietary restriction (d = 0.36, 95% CI [0.23-0.49], p < .001), drive for thinness (d = 0.47, 95% CI [0.33-0.60], p < .001), bulimic symptoms (d = 0.31, 95% CI [0.20-0.41], p < .001), purging frequency (d = 0.30, 95% CI [0.02-0.57], p < .05), and negative affect (d = 0.32, 95% CI [0.12-0.52], p < .001). Moderator analyses revealed no impact of data analytic strategy on intervention effects. Similarly, participant risk status was not a moderator for most outcomes. DISCUSSION: Internet-based programs are successful in decreasing ED symptoms and risk factors with small to moderate between-group effect sizes.
OBJECTIVE: The purpose of this meta-analytic review was, first, to evaluate the efficacy of Internet-based programs in decreasing eating disorder (ED) symptoms, and, second, to identify moderator variables these effects. METHOD: Twenty studies were identified and between-group effect sizes were calculated for ED symptoms and risk factors. RESULTS: Compared with control conditions, Internet-based programs successfully decreased body dissatisfaction (d = 0.28, 95% CI [0.15-0.41], p < .001), internalization of the thin ideal (d = 0.36, 95% CI [0.07-0.65], p < .05), shape and weight concern (d = 0.42, 95% CI [0.13-0.71], p < .05), dietary restriction (d = 0.36, 95% CI [0.23-0.49], p < .001), drive for thinness (d = 0.47, 95% CI [0.33-0.60], p < .001), bulimic symptoms (d = 0.31, 95% CI [0.20-0.41], p < .001), purging frequency (d = 0.30, 95% CI [0.02-0.57], p < .05), and negative affect (d = 0.32, 95% CI [0.12-0.52], p < .001). Moderator analyses revealed no impact of data analytic strategy on intervention effects. Similarly, participant risk status was not a moderator for most outcomes. DISCUSSION: Internet-based programs are successful in decreasing ED symptoms and risk factors with small to moderate between-group effect sizes.
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