This from another report on the results of helmet use
They found five studies that met their inclusion criteria. In each case the studies looked at situations where legislation had only covered children.
There was a clear indication that areas that introduced helmet legislation saw a decrease in head injury associated with increased use of helmets.
Which isn't really true as I read it, only that after the law, there were fewer head injuries. I say that because of this line:
"What is not clear, however, is whether the legislation caused fewer children to go out on their bikes. It may be that the reductions in injuries were a result of children using bikes less, however, there have been no high quality studies that have tested this scenario," says lead author Anneliese Spinks
So we don't know if more cyclists wore helmets (or if those helmets reduced injuries) or if there were just fewer cyclists. It'd be nice to see it compared to other cycling injuries. If head injuries went down, but shoulder injuries remained constant that would be more indicative of a helmet benefit.
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