Comparison 2. Non‐legislative interventions vs control (RCTs only).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Observed helmet wearing	3	807	Odds Ratio (M‐H, Random, 95% CI)	0.99 [0.18, 5.63]
2 Self reported helmet ownership	4	1044	Odds Ratio (M‐H, Random, 95% CI)	1.58 [0.66, 3.77]
3 Self reported helmet wearing	5	1255	Odds Ratio (M‐H, Random, 95% CI)	3.02 [0.72, 12.76]