Is a dissonance-based group intervention targeting thin-ideal internalization a successful potential add-on for specialized eating disorder care? A randomized feasibility and acceptability pilot study

Table 6 Within group effect sizes (pre- to post-treatment and pre-treatment to six months follow-up) and effect sizes for the time*group interaction (pre- to post-treatment)

Questionnaire	Cohen’s d pre-post Body Project	Psycho-education	Partial eta squared (time*group; t₁ –t₃)	Cohen’s d pre-6 months FU Body Project	Psycho-education	Partial eta squared (time*group; t₁ –t₃)
BAI – Anxiety symptoms	1.01	0.43	.001	0.54	1.77	0.047
BDI—Depressive symptoms	0.25	0.44	.005	0.94	1.84	.122
PANAS – Negative affect	0.29	0.68	.083	0.60	2.08	.115
EDE-Q—Eating disorder symptoms	0.80	0.89	.011	1.26	2.75	.002
BAT – Body dissatisfaction	0.25	0.27	.000	0.95	1.49	.028
OBCS – Body objectification	1.15	0.73	.091	0.91	1.46	.038
Body Objectification—weight	0.52	0.08	.007	0.72	0.68	.008
SATAQ – thin-ideal internalization	0.28	0.30	.009	0.81	0.22	.007

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