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That's really hard to tell. Not many people report injuries that hasn't happened, so all the "evidence" is secondary. Simply looking at the number of reported injuries doesn't tell the whole story, as there are plenty of other factors that influence the whole number of riders quite strongly for instance.

On top of that (utility oriented) bicycle riding is really quite safe, so there isn't that a big number of injuries to begin with.

Another thing is that as helmets go, bicycle helmets are a bit flimsy. Hit hard enough and you will get hurt even when wearing a helmet. The helmet will have offered quite a bit of protection, but exactly how much more you would have been hurt w/o isn't easy to determine. Maybe it's the difference between a split eyebrow AND a concussion and a split eyebrow only.
It's really hard to tell, as it's so dependent on how you fall. If you're actually run over, or hit by a car at speed, then the helmet might not be particularly helpful. But if you skid on an oil slick, get a wheel stuck in a grating or something like that they can do a lot of good.
no
85% a common CA traffic school question!
100%

If you hit your head in a bike accident, wearing a helmet will reduce head injury 100% percent of the time.

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Q: Bicycle helmets can reduce head injuries by what percentage?
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