Probably a wise move, but I'll indulge my friends, if you don't mind.
A subsequent study, again by Kellermann, of fatal and non-fatal gunshot woundings, showed that only 14.2% of the shootings involving a gun whose origins were known, involved a gun kept in the home where the shooting occurred. (Kellermann, et. al. 1998. "Injuries and deaths due to firearms in the home." Journal of Trauma 45:263-267) ("The authors reported that among those 438 assaultive gunshot woundings, 49 involved a gun 'kept in the home where the shooting occurred,' 295 involved a gun brought to the scene from elsewhere, and another 94 involved a gun whose origins were not noted by the police.") (Kleck, Gary. "Can Owning a Gun Really Triple the Owner's Chances of Being Murdered?" Homicide Studies 5 <2001>.)
Debunking the '3 times more likely to be the victim' myth -- reprise - Democratic Underground
Secondly, no correlation was made between "independent" factors that actually may have been factors related to each other- they treated illicit drug use, having an arrest record, living alone or not, renting, having a gun, and a history of domestic abuse as independent variables without any relationship to each other. No collateral multivariate analysis was performed. The correlation to each control was not predicated on other factors, just gun ownership. They gave the same weight to a gun death in a household with someone with a previous arrest as to a gun death in a household where an intruder brought their own gun to a home invasion and shot the occupant (each weighting was independent, not cumulative). No correlation was explored for similar situations with the only difference being gun ownership.
Thirdly, there were significant differences between the study participants and the control. There was a 30% difference between home ownership vs renting between subjects and control, and a 15% difference in living alone or not. Only 48% of the control subjects were interviewed in person. Never mind that there were more users of illicit drugs, alcoholics, and persons with a history of violence in the households of the case subjects than in the households of the controls.
Finally, correlation doesn't equate to causation. They state in one place, "keeping a gun in the home was strongly and independently associated with an increased risk of homicide". "Associated with", not "causally related to". The possibility of why a gun was kept in the home was not explored nor accounted for- so a person who lives in a high crime neighborhood who may already be at higher risk of homicide death was treated the same as a person shot in a "nice" neighborhood.
Further reading (some are related to Kellermann's previous work on the subject, just to show how tortured his conclusions are):
Dave Kopel on NRO
Kellermann-Gun Ownership as a Risk Factor for Homicide in the Home
Its almost like he had a idea and created data to support his predetermined conclusion...