Cycle helmets reduce head injuries and their use should be encouraged, but the impact of helmet laws seems to be minimal in reducing serious head injuries among cyclists of all ages.

Between 1994 and 2008, there were 66,716 hospital admissions for cycling related injuries, 30% of which were head injuries.
During this time, there was a substantial and consistent fall in the rate of hospital admissions for cycling related head injuries across Canada.
Reductions were greatest in provinces with helmet legislation. However, the researchers point out that admission rates were falling before the implementation of provincial helmet legislation and, after taking baseline trends into account, did not seem to change in response to legislation.
The authors say that, while helmets reduce head injuries and their use should be encouraged, in the context of existing safety campaigns, the impact of legislation seems to be minimal.
"When baseline trends in cycling related injury rates were considered, the overall rates of head injuries were not appreciably altered by helmet legislation," they say.
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