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The issue of "home defense" or protection against intruders or assailants may well be misrepresented. A study of 626 shootings in or around a residence in three U.S. cities revealed that, for every time a gun in the home was used in a self-defense or legally justifiable shooting, there were four unintentional shootings, seven criminal assaults or homicides, and 11 attempted or completed suicides (Kellermann et al, 1998). Over 50% of all households in the U.S. admit to having firearms (Nelson et al, 1987). In another study, regardless of storage practice, type of gun, or number of firearms in the home, having a gun in the home was associated with an increased risk of firearm homicide and suicide in the home (Dahlberg, Ikeda and Kresnow, 2004). Persons who own a gun and who engage in abuse of intimate partners such as a spouse are more likely to use a gun to threaten their intimate partner. (Rothman et al, 2005). Individuals in possession of a gun at the time of an assault are 4.46 times more likely to be shot in the assault than persons not in possession (Branas et al, 2009). It would appear that, rather than being used for defense, most of these weapons inflict injuries on the owners and their families.
According to the Brady Campaign, in 2010 there were 606 deaths from unintentional shootings. In 2011, there were 14,675 people injured in unintentional shootings that survived. I have no idea why they used 2 different years.
I'm going to assume the 2010 and 2011 numbers match for the different outcomes; they are probably close. I'm also going to assume 1 victim for each unintentional shooting. So, let's say 15,000 unintentional shootings per year, killed or injured.
The various stats from your studies, with the actual reported occurrences I have outlined above, would mean that:
15,000 / 4 = defensive uses near a residence (or 3750).
3750 x 7 = criminal assaults or homicides (or 26,250).
3750 x 11 = attempted or completed suicides (presumably by gun: 41,250).
I'm not great at math; feel free to correct the above. Now for figures I've pulled from the web, more than one source:
The CDC says that in 2010, there were 38,364 suicides, and that there is 1 suicide for every 25 attempts, or over 1 million attempts. Not all of these were gun suicides. See: CDC suicide datasheet (PDF)
The FBI says in 2010, there were about 778,000 aggravated assaults and 14,748 homicides (not all via gun). See here and here
Interesting snip from an opinion piece in Forbes:
A National Crime Victimization Study (NCVS) which asked victims if they had used a gun in self-defense found that about 108,000 each year [emphasis mine - Ed.] had done so. A big problem with the NCVS line of survey reasoning, however, is that it only includes those uses where a citizen kills a criminal, not when one is only wounded, is held by the intended victim until police arrive, or when brandishing a gun caused a criminal to flee. Link
The above quote includes the lowest estimate of defensive gun use per year that I have ever read - and I tend to agree with it as being the most accurate of such estimates out there.
Finally, this is an interesting discussion of the Brady Campaign's numbers about gun ownership and violence, etc.: Link
• Suicide was the tenth leading cause of death for all ages in 2010.
• There were 38,364 suicides in 2010 in the United States--an average of 105 each day.
• Based on data about suicides in 16 National Violent Death Reporting System states in 2009, 33.3% of suicide decedents tested positive for alcohol, 23% for antidepressants, and 20.8% for opiates, including heroin and prescription pain killers.
Then from another link (which I have provided):
Suicide by firearm in 2010 was 19,392
Homicide by firearm in 2010 was 11,078
http://www.cdc.gov/injury/wisqars/pdf/10LCID_Unintentional_Deaths_2010-a.pdf
http://www.cdc.gov/injury/wisqars/pdf/10LCID_Violence_Related_Injury_Deaths_2010-a.pdf
As for the FBI links, did you happen to note the following?:
The estimated number of aggravated assaults in 2010 declined 4.1 percent from 2009 and 14.3 percent when compared with the estimate for 2001.
A comparison of data for 2001 and 2010 showed that the rate of aggravated assaults in 2010 dropped 20.8 percent.
Of the aggravated assault offenses in 2010 for which law enforcement agencies provided expanded data, 27.4 percent were committed with personal weapons such as hands, fists, or feet.
Slightly more than 20 percent (20.6) of aggravated assaults were committed with firearms, and 19.0 percent were committed with knives or cutting instruments. The remaining 33.1 percent of aggravated assaults were committed with other weapons.
Between 2009-2010, aggravated assault by firearm declined by 5.5%, or 8,058 assaults.
Between 2009-2010, number of crimes per 100,000 persons: Robbery by firearm was 127,251, aggravated assault by firearm was 137,857.
2010 State by State Offenses link:
http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2010/crime-in-the-u.s.-2010/tables/10tbl22.xls