89 Dialectical behavior therapy compared to cognitive behavior therapy in binge eating disorder 4 consistency of the EDI-3 emotional dysregulation score at baseline was questionable (α = .70) in the present sample. General psychopathology was assessed by using the Dutch version of the Symptom Checklist 90 (SCL-90) (Arrindel & Ettema, 2003). The total score of this 90-item questionnaire reflects physical and psychological symptoms experienced over the past week. Higher scores indicate more psychopathology. The reliability and validity of the SCL-90 are good (Arrindel & Ettema, 2003). The internal consistency at baseline was excellent (α = .97) in the present sample. The level of depressive symptoms was assessed using the total score of the Beck Depression Inventory-II (BDI-II) (Beck et al., 1996). The BDI-II consists of 21 questions about the severity of depressive symptoms in the past week. Higher scores indicate more depressive symptoms. The reliability and validity of the BDI-II are good (Beck et al., 1996). The internal consistency at baseline was good (α = .89) in the present sample. Self-esteem was assessed with the six-item EDI-3 subscale ‘low self-esteem’ (Garner & Van Strien, 2015). Higher scores indicate lower self-esteem. The internal consistency at baseline was good (α = .87) in the present sample. Dropout Patients that stopped before the end of treatment, were considered a dropout. When staff and patient mutually agreed that treatment goals were achieved before the 20-week period ended and treatment, as a consequence, was terminated, this was considered as completion of treatment instead of dropout. Power and sample size We assessed and followed up all the patients who reported for intake between October 2011 and the end of 2016, and who met inclusion-exclusion criteria. No a priori power analysis was conducted. Statistical Analyses All analyses were conducted using SPSS Version 25 (IBM Corp, 2017). Baseline demographic and clinical characteristics were summarized separately for the CBT and DBT treatment groups. For continuous measures, 95% confidence intervals of the difference between groups was calculated, along with effect size information based upon Cohen’s d. For categorical measures, effect size information was calculated based upon the phi coefficient.
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