31 Predictors of outcome for cognitive behaviour therapy in binge eating disorder 2 was 41.92 kg/m2 (SD = 6.90, range 25 – 66 kg/m2). Of these patients, 2.0% were overweight (BMI 25 - 29.9 kg/m2), 12.2 % were Grade I obese (BMI 30 – 34.9 kg/m2), 30.4% were Grade II obese (BMI 35 – 39.9 kg/m2), and 55.4% were morbidly obese (BMI 40 kg/m2 and higher). Age and BMI distribution for treatment-completing patients that completed follow-up measures were similar to those reported earlier. Materials Eating disorder-related measures The Dutch translation of the EDI-1 was used as a measure for eating disorder psychopathology (Garner et al., 1983; Schoemaker et al., 1994). The EDI-1 consists of 64 items concerning psychological and behavioural eating disorder symptomatology. Items such as ‘I feel extremely guilty after overeating’ are answered on a 6-point Likert scale. The EDI-1 consists of eight subscales: drive for thinness (DT), bulimia, (B), body dissatisfaction (BD), ineffectiveness (I), perfectionism (P), interpersonal distrust (ID), interoceptive awareness (IA), and maturity fears (MF). Higher scores indicate higher eating disorder psychopathology. The bulimia subscale was used as the measure for binge eating pathology. The reliability and the validity are considered to be good for use in eating disorder patient groups (e.g., Garner et al., 1983; Van Strien & Ouwens, 2003; Welch et al., 1990), and internal consistency was found to be good in the present sample (α = .805). The Dutch version of the Body Attitude Test (BAT) was used to measure subjective body experience and attitude towards one’s body (Probst et al., 1995). The BAT consists of 20 items such as ‘When I compare myself with my peers’ bodies, I’m dissatisfied with my own’ which are answered on a 6-point Likert scale. The BAT consists of three subscales: negative appreciation of body size, lack of familiarity with one’s own body, and general body dissatisfaction (and a rest factor). Higher scores indicate a more deviant body experience. The reliability and validity of the BAT are considered to be good (Probst et al., 2008; Probst et al., 1995), and internal consistency was found to be good in the present sample (α = .755). General psychopathology The Dutch version of the Symptom Checklist 90 (SCL-90) was used to measure general psychopathology (Arrindell & Ettema, 2003). The SCL-90 consists of 90 items related to the frequency of experienced physical (e.g., suffering from headache) and psychological (e.g., feeling lonely) complaints in the last week, which are answered on a 5-point Likert scale. The SCL-90 comprises eight subscales: agoraphobia, anxiety, depression, somatization, insufficiency, distrust, hostility and sleeplessness. The items can be summed for a total
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