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Editor,—The article by Dr Kopjar in a recent issue of the journal discussing the use of the population preventable fraction concerning bicycle related head injuries and helmet use was very interesting.1 Dr Kopjar uses the odds ratio (OR), obtained from case-control studies of the effectiveness of bicycle helmet use to prevent head injury, to provide an estimate of the relative risk (RR) required in the formula for the population attributable fraction. In the article, Dr Kopjar stated that “Incidence of head injuries is low, suggesting that these ORs can be used as a valid proxy for the RR”. …
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