But what conclusions do you draw from these statistics? Remember the main idea when being attacked is not to fatally wound the attacker, but to stop them right now from attacking. I'll bet that in many of these instances the person shot either died on the way to the hospital, maybe at the hospital, or at least a few minutes after the incident. I'm sure some lost the ability or will to fight right away, but how many didn't? If they didin't you're still in danger. I'd still bet on larger calibers to maximize my chances of stopping the attacker right now.
Heck, you could shoot someone with a .22 in the leg in the middle of the desert and it may prove to be a fatal wound, but is that what we're looking for?