I forgot to post this when it came out from the CDC in June, as you can see a rider's education did play a significant part in reducing motorcycle deaths. If you didn't sleep though high school you will have a basic understanding of mathematics and understand a report that uses percentages and then it will be time to helmet up.
It is unfortunate that there is not a study that goes into more detail on :
1.helmet type worn (novelty, salad bowl, pirate, open face , full face),
2.the safety certification the helmet of the helmet wearing fatality was wearing,
3. Type and area of facial injuries
4.BAC of rider, etc
I suspect that there is a lack of data gathering consistency