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use of bicycle helmets was found to reduce head injury by 48%
So down from 3×10-7 head injuries per trip to 1.5×10-7. If 6 million people cycle to work one morning and none of them wears a helmet, two of them will require hospital treatment for a head injury. If all of them wear helmets, only one person will require hospital treatment for a head injury.
gbj_tester
¡apesta!
Pubmed link to a large, frequently cited study, Bicycle helmets - To wear or not to wear? A meta-analyses of the effects of bicycle helmets on injuries
If you're going to cycle drunk, consider wearing a helmet.