Orchowski 2008.

Methods	RCT. Students randomly allocated to intervention or control
Participants	300 female undergraduate students (91.7% aged 18‐19 years) at a Midwestern university, USA
Interventions	Intervention: part 1: didactic/interactive course and video; part 2: self defence course lasting 2 hours, delivered 2 weeks after part 1; part 3: booster revision course lasting 1 hour, delivered 2 months after part 1. Delivered by female graduate students. 157 students Control: Peer‐based vaccine preventable disease education and awareness program. 143 students
Outcomes	Incidence of sexual assault, recognition of risky dating situations, knowledge of resources available, and self efficacy in responding to threatening dating situations, as measured by Sexual Experiences Survey, Dating Self‐Protection Against Rape Scale, Sexual Communication Survey, Self‐efficacy Scale, Rape Attribution Scale and a multiple choice test of knowledge
Follow‐up	2 and 4 months post‐test
Notes	‐
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Study used "random assignment"
Allocation concealment (selection bias)	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Low risk	Attrition rate at 2 months: 12% (36/300). Attrition rate at 4 months: 54% (163/300). Reasonable rate for 2 and 4 months
Selective reporting (reporting bias)	Low risk	All outcomes reported fully (number of participants, means and SDs for continuous scales; n and % for categorical scales)
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Blinding not possible, but facilitators received training and were supervised to ensure they adhered to study protocol
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated