I doubt that there is any way to control for the many variables that exist, but it is safe to say that attitude and mind set are really significant in surviving.

I have seen people who were unbelievably passive in survival situations, totally at the mercy of circumstances, and very fortunate that outside assistance arrived. Of course, you never hear of those who self rescue in almost identical situations (for that matter, what constitutes "identical situations"?). We are not dealing with lab rats here.....