Pretty much everything I already mentioned related to how safe is it to own a gun and how dangerous is it to own a gun. In Epidemiology, we can correlate everything bad with smoking. I doubt the same could be said about gun ownership beyond what seems common sense.
If you're focusing on the guns and not the circumstances of the people who use them, the numbers you are looking for are meaningless.
All firearm deaths
2011 2010• Firearm deaths by suicide:.......................................... 19,766..................19,392
• Firearm deaths by accident:........................................8 51......................606
• Firearm deaths caused by LEO (non-accidental):.............258...................... 412
• Firearm deaths by homicide (total):...............................11,101..... .............11,078
• Firearm homicides (gang related and included in total):......8,880 (80%)...........8,862 (80%)
• Firearm homicides (non gang and included in total):...........2,220 (20%)...........2,215 (20%)
• Firearm deaths of self defense*
and undetermined intent:........................................... ..4,224....................4,656
• Total number of legal US firearm owners (Est): 52,000,000 households
2,220 gun-related deaths are actual non-gang-related murders. That's 20% of the total. Murder is illegal.
The majority of gang members are minors, felons or have convictions for violent crimes and drug abuse. Owning guns for this group is unlawful for the majority.
Those are verified stats. Now, how do you intend to use the data?.