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The effectiveness of helmets in reducing head injuries and hospital treatment costs: a multicentre study

To the Editor: Debate continues regarding the health benefits and consequences of helmet use in pedal cyclists.1 Australia is one of few countries in the world with mandatory helmet laws for both pedal cyclists and motorcyclists. To place the protective effect of helmets in pedal cyclists into perspective, we report on the relationship between helmet use and head injury severity in a retrospective cohort of both pedal cyclists and motorcyclists.

Trauma registry data on such patients admitted to seven tertiary level hospitals in Sydney, New South Wales (Liverpool, St George, Royal Prince Alfred, Westmead, Royal North Shore, St Vincent’s and Prince of Wales hospitals) between July 2008 and June 2009 were obtained. Patients were included if they were aged 15 years or over with an incident occurring on a public road. The Abbreviated Injury Scale and Injury Severity Score were used to classify body regions and severity of injury, respectively. Helmet use, incident and other injury details were routinely collected by trained data and case managers from standard ambulance and trauma clinical case notes. Inhospital costs were calculated using standardised cost weights (NSW Program and Product Data Collection, 2008–09). Primary outcomes were any head injury and severe head injury (Abbreviated Injury Scale severity…

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