stitch of research, i can show that people who have had more car accidents live, on average, longer then people that have had very few car accidents.
why? because each year you live you have a chance of racking up another car accident. in general, the older you live, the more car accidents you are likely to have had.
if you want to know whether people who have more accidents are more likely to live longer because of the car accidents, you have to do something like take 40 year-olds and compare the number of 40 year-olds that make it to 41 in your high and low accident groups (simple check), or 