Foubert 2000.

Methods	Cluster‐RCT. 8 fraternities were randomly allocated to intervention (n = 4) or control (n = 4)
Participants	217 fraternity members (male only; mean age 20.33 years, SD 1.23) at a university, USA
Interventions	Intervention: rape prevention peer education programme including lecture and video. Delivered by 4 male peer educators who followed a prepared script. The intervention was delivered as a single 1‐hour session. 109 students Control: no intervention. 108 students
Outcomes	Episodes of dating violence and change in knowledge about dating violence, as measured by the Rape Myth Acceptance Scale, Behavioural Intent to Rape Scale, and the Sexual Experiences Survey
Follow‐up	Intervention: immediate and 7 months post‐test. Control: 7 months post‐test
Notes	‐
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Groups "randomly assigned" to intervention or control
Allocation concealment (selection bias)	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Low risk	Attrition: intervention group 36% (39/109); control group 31% (33/108). Attrition rates similar in both arms and unlikely to be caused by attrition bias
Selective reporting (reporting bias)	Low risk	All outcomes reported (number of participants, means and SDs provided)
Blinding of participants and personnel (performance bias) All outcomes	High risk	Blinding not possible. No mention of training of peer‐educators or monitoring of adherence to study protocol
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated