I gave this study some more thought today and I think the authors are making another big mistake. Let's say two people fell off a two-story roof while cleaning gutters. They have an identical fall. They are both the same age, say 60. Who is more likely to die as a result of that injury? The very out-of-shape unhealthy person or the healthy person? The g-forces when they hit the ground are different. And their ability to recover are different. Yes, healthy people should recover from accidents more frequently than unhealthy people.