I think what mr_bill is saying is the same thing I brought up, what about all the people that had a crash and hit their heads but aren't counted in any statistics because it wasn't reported to anyone because the helmet worked good enough for them that they just dusted themselves off, and went on their way... Could be 10s of thousands of people in a year...

EDIT; That number will never be known, thus the helmet thread... If it could be known there would be no helmet thread, but since nobody can say XXX number of people were helped and they didn't go to the ER, we only know the XXX number of people it didn't help enough to keep them from the ER...