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Table 2 Pretreatment and post-treatment means (SD) for outcome groups based on the EDE-Q global score

From: Exploring effectiveness of CBT in obese patients with binge eating disorder: personality functioning is associated with clinically significant change

  

Pretreatment scores

Post-treatment scores

   
 

Outcome variables

M (SD)

M (SD)

Test statistics

p

Hedges’s gav

Recovered (n = 62)

EDE-Q global score

3.51 (0.83)

1.13 (0.55)

t(61) = 20.24

p < .001

3.35

 

EDE-Q OBE scale scores

5.92 (7.37)

0.50 (1.13)

t(61) = 6.12

p < .001

1.02

 

BMI

39.02 (5.25)

38.12 (4.95)

t(60) = 3.54

p < .001

0.15

Improved (n = 31)

EDE-Q global score

4.26 (0.55)

2.96 (0.39)

t(30) = 15.07

p < .001

2.63

 

EDE-Q OBE scale scores

10.60 (10.18)

1.90 (2.90)

t(29) = 4.96

p < .001

1.13

 

BMI

38.21 (6.69)

37.28 (6.63)

t(30) = 2.91

p = .007

0.14

Unchanged/

EDE-Q global score

3.42 (0.71)

3.26 (0.67)

t(46) = 2.49

p = .016

0.22

deteriorated (n = 47)

EDE-Q OBE scale scores

6.48 (10.72)

2.54 (3.76)

t(45) = 2.57

p = .013

0.48

 

BMI

40.39 (6.30)

40.19 (6.01)

t(46) = 0.90

p = .371

0.03

  1. Notes: EDE-Q, Eating Disorder Examination Questionnaire; BMI, body mass index; p = p value. Hedges’s gav effect size: 0.20 = small; 0.50 = medium; 0.8 = large [67]. Analyses excluding deteriorated patients (n = 3) result in equal results in terms of significance. Given occurrences of positive skewness of distributions of difference scores for the above three outcome variables (skewness/SE > 1.96), Wilcoxon tests were computed to confirm all parametric results. Non-parametric test statistics resulted in p-values of comparable size as reported above, with the exception of a clearly smaller p-value for differences in the EDE-Q binge eating frequency in the unchanged/deteriorated group, with z = 2.63, p = .008