92 Chapter 4 Table 1: Baseline demographic and clinical characteristics Variable CBT (N = 133) DBT (N = 42) 95% CI Effect size1 Age (mean, SD) 33.46 (10.75) 39.40 (10.22) 2.23, 9.66 d = .559 Female (n, %) 118 (88.7%) 38 (90.5%) --- Φ = .024 Dutch nationality (n, %) 128 (96.2%) 41 (97.6%) --- Φ = .165 University education (n, %) 12 (9.0%) 2 (4.8%) --- Φ = .210 Living with partner/spouse2 (n, %) 62 (52.5%) 22 (62.9%) --- Φ = .206 BMI (mean, SD) 42.10 (7.74) 42.77 (7.36) -2.01, 3.34 d = .088 Full BED diagnosis (n, %) 111 (83.5%) 36 (85.7%) --- Φ = .026 Duration of illness (mean, SD)3 15.89 (10.31) 21.34 (13.13) 1.35, 9.55 d = .492 Lifetime vomiting (n, %) 25 (18.8%) 9 (21.4%) --- Φ = .146 Lifetime laxatives (n, %) 14 (10.5%) 5 (11.9%) --- Φ = .083 Lifetime diuretics (n, %) 3 (2.3%) 1 (2.4%) --- Φ = .004 Lifetime excessive exercise (n, %) 93 (69.9%) 25 (59.5%) --- Φ = .153 OBE episodes (mean, SD) 7.06 (7.93) 6.52 (9.33) -3.43, 2.36 d = -.056 EDE-Q Global (mean, SD) 3.42 (0.96) 3.33 (1.11) -0.45, 0.25 d = -.031 DEBQ Emotional Eating (mean, SD) 3.89 (0.60) 4.03 (0.69) -0.08, 0.36 d = .231 SCL-90 Total (mean, SD) 192.26 (53.04) 200.26 (63.47) -11.46, 27.46 d = .126 BDI-II Total (mean, SD) 23.78 (11.15) 22.88 (11.16) -4.80, 3.00 d = -.081 EDI-3 Low Self-Esteem (mean, SD) 12.17 (5.59) 12.33 (5.37) -1.77, 2.10 d = .029 EDI-3 Emotional Dysregulation (mean, SD) 6.18 (4.34) 6.18 (4.57) -1.54, 1.53 d = .001 CI = confidence interval 1Cohen’s d for continuous measures and phi coefficient for categorical measures 2N = 153 (CBT = 118; DBT = 35); 3N = 152 (CBT = 114; DBT = 38). Study retention A total of 28 (16.0%) participants dropped out of the treatment during the course of the trial, including 20 (15.0%) from CBT+ and 8 (19.0%) from DBT-BED (Fisher’s Exact p = .63). Two participants (1.5%) in the CBT+ group and none in the DBT-BED group discontinued treatment before 20 weeks because they had achieved treatment goals. Of the 175 participants that started treatment, 140 (80%) completed end of treatment assessments and 91 (52%) completed follow-up assessments. Assessment completion rates for CBT+ and DBT-BED were 51.9% vs. 52.4% (Fisher’s Exact p = 1.00) at follow-up. There were no differences between dropout and completers on gender, age, duration of illness, living situation, BMI as well as all primary and secondary outcome measures.
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