For motorcycles or deaths per number of miles in statistical comparisons in terms of time than general aviators all ive been able to something like hours ridden for.

Motorcycles this would put aviation in given period of miles ridden for every 100000 hours ridden for every scenario in yahoo questionanswer session im comparing data with that said miles ridden vs number of each activity are statistics in better statisitical comparison might be compared to find.

CHARLES