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  • Title: Misconceptions regarding case-control studies of bicycle helmets and head injury.
    Author: Cummings P, Rivara FP, Thompson DC, Thompson RS.
    Journal: Accid Anal Prev; 2006 Jul; 38(4):636-43. PubMed ID: 16417901.
    Abstract:
    A number of published case-control studies have reported that bicycle helmets are associated with a reduced risk of head injury and brain injury among bicyclists who crashed. A paper in this journal offered several criticisms of these studies and of a systematic review of these studies. Many of those criticisms stem from misconceptions about the studies that have been done and about case-control studies in general. In this manuscript we review case-control study design, particularly as it applies to bicycle helmet studies, and review some aspects of the analysis of case-control data.
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