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. 2010 Mar 9;182(4):333–340. doi: 10.1503/cmaj.091080

Figure 2.

Figure 2

The effectiveness of helmets in preventing head injuries. The size of the data marker corresponds to the relative weight assigned in the pooled analysis. CI = confidence interval, OR = odds ratio. I2 = 72.9%. *Unadjusted OR and 95% CI calculated from data provided in original study. †OR and 95% CI provided in original study for patients 13–16 years old; an even greater protective effect for helmets was seen among children less than 12 years old (OR 0.21, 95% CI 0.12–0.36). ‡Adjusted OR and 95% CI provided in original study. §OR and 95% CI provided in original study.