91 Dialectical behavior therapy compared to cognitive behavior therapy in binge eating disorder 4 All outcome analyses were based upon the intention-to-treat principle (McCoy, 2017). Multiple imputation using fully conditional Markov chain Monte Carlo (MCMC; Schafer, 1987) modeling was used to impute missing data at baseline, end of treatment and follow-up. The final analyses were based upon the pooled results of 20 separate imputation sets. Sensitivity analyses were conducted using maximum likelihood imputation. As results were generally consistent across sensitivity methods, the final results for multiple imputation are presented. Clinically meaningful change was operationalized as proposed by Jacobson & Truax (1991). We calculated the percentage of patients on the EDE-Q Global score that shifted from being closer to the mean of the dysfunctional group (current sample: mean = 3.40; SD = 1.00) to being closer to the mean of a functional group (i.e. a normative non-students sample of males and females from the United Kingdom: mean = 1.92; SD = 1.42 (Carey et al., 2019). Results Study participants A total of 175 participants started treatment: 133 in CBT+ and 42 in DBT-BED, 84% had full BED diagnosis and 16% subthreshold BED. Participants included 156 (89.1%) women and 19 (10.9%) men, with an average age of 34.9 years (SD = 10.9, range = 17 – 69) and an average duration of illness of 17.3 years (valid N = 152, SD = 11.3, range = 0.6 – 55.0). BMI of participants averaged 42.3 (SD = 7.6, range = 23.9 – 68.1). More than half of the participants (valid N = 153, n = 84 [55%]) lived with a partner/spouse. Table 1 presents baseline demographic and clinical characteristics separately by treatment. There were no significant differences between this study’s sample and Lammers et al. (2020) except for BMI and BDI-II scores. Both were significantly higher in the present study, with small effect sizes (BMI: current study M = 42.3, SD = 7.6; randomized study: M = 39.9, SD = 5.6; 95% CI = -4.10 - -0.68; d = .251; BDI-II: current study M = 23.56, SD = 11.13; randomized study: M = 20.77, SD = 9.26; 95% CI = -5.49 - -0.10; d = .344).
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