On 5/18/2017 7:20 AM, Radey Shouman wrote:

snip

I think that was my first point, which you snipped. Not that I agree
that helmet effectiveness is under-estimated.

No one reports head impact crashes where there is no injury. As Jay
pointed out, there are a lot of crashes where a helmet completely
prevents lacerations, and those don't result in an ER visit.