Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Improvement in bulimia symptoms
RCT 4-armed trial	77 women with bulimia nervosa characterised by purging behaviour In review	Change from baseline in frequency of vomiting over 1 week after 4 months of treatment –6.4 with CBT plus exposure/response prevention (CBT-ERP) of vomiting –0.2 with waiting list control	Difference reported as not significant P value not reported Not analysed on an intention-to-treat basis, see further information on studies		Not significant
Depression
RCT 4-armed trial	77 women with bulimia nervosa characterised by purging behaviour In review	Change from baseline in Beck Depression Inventory Score –9.9 with CBT-ERP of vomiting –0.7 with waiting list control	P <0.05 Not analysed on an intention-to-treat basis, see further information on studies	Effect size not calculated	CBT-ERP