I don't have a recent, legitimate study. I do know that the frequent "you're x-times more likely to be killed by your own gun than to kill a criminal" stats are cooked. I have yet to see one of those studies where they're actually comparing home- or self-defense. They study only deaths, leaving off the fact that most home-/self-defense incidents don't result in death or injury to the criminal -- the person defending themselves isn't typically looking to fire the gun, only to keep themselves from being hurt, so the criminal retreats unscathed.
When Florida instituted its carry-permit law, the Dade County Sheriff started a program to track criminal incidents and accidents involving people with permits. Seven (I think) years later they closed the program because it had less than ten entries.