You can judge for yourself whether it's better than no study at all. Aha, you say, but Fred Taylor has repeatedly shown that he can't stay healthy. Maybe the trend will become more clear if we look at two years instead of just one. So we'll do just that. The spread is a little wider, but there's still not a game and a half difference between the expectation of an RB with a spotless health record and one who missed several games.
Football is a rough game, and running back is a rough position.
Perhaps not surprisingly, the situation is somewhat different for wide receivers. But across all levels of injury history, WRs are more likely to stay healthy than RBs are. Again, no real surprise, but it's nice to be able to attach a numerical estimate to the difference. Quarterbacks just flat out shouldn't be expected to play 16 games, except those named Brett Favre. I didn't realize just how grim the situation was.