Lanier 1998.

Methods	RCT. Participants randomly allocated to treatment and control in "approximately equal numbers"
Participants	615 initially invited. 436 first‐year students participated (98.3% aged 17‐19 years; no information on sex distribution) at an elite, private university, USA
Interventions	Intervention: students watched a play with 6 scenes following script entitled "Scruples" depicting date rape. The intervention was delivered as a single 1‐hour session. 218 students (estimated) Control: students watched a play addressing multi‐cultural issues. 218 students (estimated)
Outcomes	Attitudes towards date rape as measured by College Date Rape Attitude Survey
Follow‐up	Immediate post‐test
Notes	‐
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Participants "randomly assigned"
Allocation concealment (selection bias)	Unclear risk	Not stated
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Unclear; no information provided
Selective reporting (reporting bias)	Low risk	Outcome reported, though only mean score (no SD) and summary statistics reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Blinding not possible. Unclear who delivered intervention or what training and monitoring they received
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated