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They reference that study (from Seattle) and say they used those who suffered brain injuries rather than death, and also that their results are consistent.
The numbers of deaths is obviously going to be limited.
In regard to sample size, I can't explain the magics, but surprisingly small numbers can be informative. We should ask Vidal what he thinks.
They point to some of the limitations of their study, but most they mention involve underestimating.
To be honest, I don't wear a helmet, nor am I clued up in the helmet debate. Just thought this would be an interesting article for those caught up in the "fight."