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The effect of helmet use on the risk of neck injury. The size of the data marker corresponds to the relative weight assigned in the pooled analysis. CI = confidence interval, OR = odds ratio. I2 = 44.7%. *Unadjusted OR and 95% CI calculated from data provided in original study. †OR and 95% CI provided in original study. ‡Adjusted OR and 95% CI provided in original study.
