Firearms and Suicide in the United States: Is Risk Independent of Underlying Suicidal Behavior?

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Abstract

On an average day in the United States, more than 100 Americans die by suicide; half of these suicides involve the use of firearms. In this ecological study, we used linear regression techniques and recently available state-level measures of suicide attempt rates to assess whether, and if so, to what extent, the well-established relationship between household firearm ownership rates and suicide mortality persists after accounting for rates of underlying suicidal behavior. After controlling for state-level suicide attempt rates (2008-2009), higher rates of firearm ownership (assessed in 2004) were strongly associated with higher rates of overall suicide and firearm suicide, but not with nonfirearm suicide (2008-2009). Furthermore, suicide attempt rates were not significantly related to gun ownership levels. These findings suggest that firearm ownership rates, independent of underlying rates of suicidal behavior, largely determine variations in suicide mortality across the 50 states. Our results support the hypothesis that firearms in the home impose suicide risk above and beyond the baseline risk and help explain why, year after year, several thousand more Americans die by suicide in states with higher than average household firearm ownership compared with states with lower than average firearm ownership.

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Suicide in the home in relation to gun ownership.

Arthur Kellermann, Frederick Rivara, Grant R. Somes … (1992)

It has been suggested that limiting access to firearms could prevent many suicides, but this belief is controversial. To assess the strength of the association between the availability of firearms and suicide, we studied all suicides that took place in the homes of victims in Shelby County, Tennessee, and King County, Washington, over a 32-month period. For each suicide victim (case subject), we obtained data from police or the medical examiner and interviewed a proxy. Their answers were compared with those of control subjects from the same neighborhood, matched with the victim according to sex, race, and age range. Crude and adjusted odds ratios were calculated with matched-pairs methods. During the study period, 803 suicides occurred in the two counties, 565 of which (70 percent) took place in the home of the victim. Fifty-eight percent (326) of these suicides were committed with a firearm. After excluding 11 case subjects for various reasons, we were able to interview 80 percent (442) of the proxies for the case subjects. Matching controls were identified for 99 percent of these subjects, producing 438 matched pairs. Univariate analyses revealed that the case subjects were more likely than the controls to have lived alone, taken prescribed psychotropic medication, been arrested, abused drugs or alcohol, or not graduated from high school. After we controlled for these characteristics through conditional logistic regression, the presence of one or more guns in the home was found to be associated with an increased risk of suicide (adjusted odds ratio, 4.8; 95 percent confidence interval, 2.7 to 8.5). Ready availability of firearms is associated with an increased risk of suicide in the home. Owners of firearms should weigh their reasons for keeping a gun in the home against the possibility that it might someday be used in a suicide.

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Suicide acts in 8 states: incidence and case fatality rates by demographics and method.

R Spicer, Andrew Miller (2000)

This study examined incidence rates of medically identified suicide acts (self-inflicted injuries, either fatal or nonfatal) and case fatality rates by age, sex, race, and method used. The authors analyzed data on 10,892 suicides and 57,439 attempted suicides among hospital-admitted individuals in 8 states, along with 6219 attempted suicides among individuals released from emergency departments in 2 states. The 8 states experienced a mean of 11 suicides and 119 attempted suicides per 100,000 residents each year. Groups with high suicide rates were men, the elderly, and Whites; groups with high attempted suicide rates were teenagers, young adults, women, and Blacks and Whites aged 25 to 44 years. Blacks aged 15 to 44 years evidenced high attempted suicide rates undocumented in previous studies. Poisoning and firearm were the most common methods used among those attempting suicide and those completing suicide acts, respectively. The most lethal method was firearm. The characteristics of suicides and attempted suicides differ dramatically. Method used is important in the lethality of the act.