Cushman 1991a.

Methods	RCT. The analysis was not undertaken blind to treatment group. 89% of those allocated to each treatment group were included in the analysis.  An assessment of the distribution of a number of confounders is presented and no statistically significant differences were reported.
Participants	373 one to 17 year‐olds presenting to an emergency room in Canada with bicycle‐related injuries
Interventions	Helmet promotion counselling from emergency physician. The control group received none of the above interventions.
Outcomes	Self reported helmet ownership. Measured at 2 to 3 weeks.
Notes	This study excluded children already owning helmets
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	Unclear