| Methods |
CBA. Neither outcome assessment nor the analysis were undertaken blind to treatment group allocation. 50% of schools allocated to the intervention arm and 54% of those allocated to the control arm were included in the analysis. An assessment of the distribution of confounders was not reported. |
| Participants |
5 to 12 year‐olds attending 4 intervention schools and 19 control schools in Idaho, US. The numbers of children at each school are not reported. |
| Interventions |
Community and school‐based helmet promotion programme including the provision of free and subsidised helmets. The control group received none of the above interventions. |
| Outcomes |
Observed helmet wearing. Measured at approximately 12 months. |
| Notes |
This study reported the results of a bicycle and motor vehicle safety promotion programme. Only data relevant to this review have been extracted. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
High risk |
Not used |
