No clear evidence from countries that have enforced the wearing of helmets.
University of New England, Armidale, NSW 2351, Australia. drobinso@aanet.com.au
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Robinson
D000063:Accidents, Traffic / Q000706:statistics & numerical data*; D000328:Adult; D001315:Australia / Q000453:epidemiology; D001642:Bicycling / Q000293:injuries* / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data; D002648:Child; D006259:Craniocerebral Trauma / Q000453:epidemiology / Q000517:prevention & control*; D006260:Head Protective Devices / Q000706:statistics & numerical data*; D006801:Humans; D009520:New Zealand / Q000453:epidemiology; D009674:Nova Scotia / Q000453:epidemiology; D012449:Safety