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Yeah, your maths check out. Presumably that's one of the reasons the NIH doesn't push helmet mandates.
Anyway, I've removed my post because it wasn't helpful.
¡apesta!-
I've removed my post because it wasn't helpful
There is nothing wrong with posting good information about the real world effectiveness of helmets, I just wanted to remind people of the context. It's like these tabloid headlines "Doing X halves your chance of dieing of Y"; even if the study actually bears out the headline, it's of limited utility to the average punter if his whole life probability of dieing of Y was already 10-5 or less.
gbj_tester
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.