39 Predictors of outcome for cognitive behaviour therapy in binge eating disorder 2 Table 5. Final model (and test statistics) for the prediction of follow-up EDI bulimia scale scores as predicted from post-treatment measures. Model summary (n = 158) F (10,148) = 11.682 p < .01 R2 adj = .403 β t p EDI bulimia scale scores 0.375 4.654 < .01 EDI drive for thinness -0.195 -2.360 .02 EDI interoceptive awareness 0.204 2.405 .02 SCL-90 anxiety 0.218 2.230 .03 SCL-90 somatic complaints -0.172 -1.671 .10 SCL-90 insufficiency 0.246 2.299 .02 SCL-90 hostility -0.186 -2.267 .03 BAT lack of familiarity with one’s own body 0.265 2.848 < .01 BMI -0.105 -1.675 .10 NEO-PI-R Conscientiousness 0.139 1.752 .08 Note: EDI, Eating Disorder Inventory; SCL-90, Symptom Checklist-90; BAT, Body Attitude Test; BMI, body mass index; NEO-PI-R, Revised Neuroticism-Extraversion-Openness Personality Inventory Means, standard deviations and correlations between post-treatment predictors and follow-up outcome are presented in supplementary tables (Tables S4-S6). Discussion This study investigated possible baseline predictors of outcome at post-treatment, and end-of-treatment predictors of outcome at follow-up in an intensive outpatient group CBT for BED. Cognitive behaviour therapy was effective in reducing binge eating pathology (as measured by the bulimia subscale of the EDI), but not in reaching relevant weight loss at post-treatment. Effects stabilised up until 6 months after treatment for binge eating pathology, while BMI showed further improvement, resulting in a weight reduction of more than 3% from pretreatment to follow-up6. We found several robust predictors over the two analyses, namely levels of binge eating pathology, drive for thinness and 6 The average drop in BMI was 2.62% between pretreatment and post-treatment and 4.89% between pretreatment and follow-up. As weight maintenance has been defined as less than 3% weight change, a weight reduction of 3% or more can be considered weight loss. Expert opinion holds that a weight loss of 5–10% of body weight is sufficient to affect health (Stevens et al., 2006).
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