A single-arm pilot study of guided self-help treatment based cognitive behavioral therapy for bulimia nervosa in Japanese clinical settings

Table 3 Changes in the frequencies of bingeing and purging, psychological tests between pre and post CBT-GSH (n = 25)

	Pre CBT-GSH		Post CBT-GSH^c		P	Effect size
	Mean	SD	Mean	SD	P	d	(95% CI)
Objective binge days^a (EDE 16D)	17.56	9.93	8.48	10.73	< 0.001*	0.88	(0.30, 1.46)
Purge days^a (EDE 16D)	17.24	11.31	9.44	11.81	0.001*	0.67	(0.10, 1.25)
Frequency of binge episodes^b (EDE-Q item 17)	21.88	15.69	10.96	17.12	0.001*	0.67	(0.09, 1.24)
Frequency of purge episodes^b (EDE-Q item 22)	22.44	19.32	10.88	16.35	0.001*	0.65	(0.08, 1.22)
BMI	20.34	2.34	20.63	2.10	0.280	− 0.13	(− 0.68, 0.42)
EDE-Qg	4.10	1.27	2.49	1.57	< 0.001*	1.13	(0.53, 1.73)
EDE-Qr	3.54	1.70	1.86	1.85	< 0.001*	0.95	(0.36, 1.54)
EDE-Qe	3.93	1.42	2.03	1.69	< 0.001*	1.22	(0.61, 1.83)
EDE-Qw	4.38	1.27	2.91	1.59	< 0.001*	1.02	(0.43, 1.61)
EDE-Qs	4.54	1.28	3.16	1.64	< 0.001*	0.94	(0.35, 1.53)
BITEss	11.84	3.09	5.40	4.72	< 0.001*	1.61	(0.97, 2.25)
BITEsas	23.84	4.95	14.48	8.40	< 0.001*	1.36	(0.74, 1.98)
PHQ-9	13.92	6.75	6.28	4.90	< 0.001*	1.30	(0.68, 1.91)
GAD-7	8.68	5.19	4.16	3.79	< 0.001*	0.99	(0.41, 1.58)

CBT-GSH guided self-help treatments based on cognitive behavioral therapy, SD standard deviations, d Cohen’s d, EDE 16D Eating Disorder Examination Edition 16.0D, EDE-Q Eating Disorder Examination Questionnaire, BMI body mass index, BITE Bulimic Investigatory Test; Edinburgh, PHQ-9, 9-item patient health questionnaire, GAD-7 7-item generalized anxiety disorder scale
* P < 0.05, within-group t-tests
^aNumber of symptomatic days during the previous 28 days
^bNumber of symptomatic episodes during the previous 28 days
^cThe presented date includes the data gathered from 2 dropped out participants at the final visit

ISSN: 1756-0500