Homicide and suicide risks associated with firearms in the home: a national case-control study

Fatal and Nonfatal Firearm Injury Rates by Race and Ethnicity in the United States, 2019 to 2020

BACKGROUND

Racial disparities in firearm injury death in the United States are well established. Less is known about the magnitude of nonfatal and total firearm injury.

OBJECTIVE

To combine health care data with death certificate data to estimate total firearm injuries in various racial and ethnic groups.

DESIGN

Retrospective, cross-sectional study.

SETTING

Fatal injury data were collected from the Centers for Disease Control and Prevention. Data on nonfatal injuries were collected from the Nationwide Emergency Department Sample (NEDS), a 20% stratified sample of U.S. emergency department visits, weighted to provide national estimates for the United States, 2019 to 2020.

PARTICIPANTS

All firearm injuries and deaths in the United States.

INTERVENTION

Race and ethnicity were classified into 5 mutually exclusive categories: Asian or Pacific Islander, Black, Hispanic, Native American, and White. International Classification of Diseases, 10th Revision codes were used to classify firearm injury intent.

MEASUREMENTS

Incidence of fatal and nonfatal injury in the U.S. population and case-fatality ratios (CFRs).

RESULTS

There were 252 376 total firearm injuries, including 84 908 deaths from firearm injures. Of all firearm injuries, 37.8% were unintentional, 37.3% were assault related, 21.0% were self-harm, and 1.3% were law enforcement associated. Self-harm had the highest CFRs (90.9% overall). Unintentional injuries accounted for just 1021 (1.2%) deaths but 94 433 (56.4%) of nonfatal injuries. Rates of self-harm were highest among White persons (11.0 per 100 000 population in 2020) followed by Native Americans (8.6 per 100 000). Rates of assault were highest among Black persons (70.1 per 100 000), as were unintentional injuries (56.1 per 100 000).

LIMITATION

Findings are limited by the accuracy of discharge coding in NEDS, particularly regarding injury intent and patient race and ethnicity.

CONCLUSION

From 2019 to 2020, the total burden of firearm injuries amounts to an average of 1 injury every 4 minutes and 1 death every 12 minutes in the United States. Racial disparities in firearm injury death are mirrored in nonfatal injury.

PRIMARY FUNDING SOURCE

None.

Firearm ownership for protection in the USA, 2023: results from a nationally representative survey

OBJECTIVE

This study aims to characterise the motivations of firearm owners and examine whether firearm ownership motivations and carriage varied by state stand your ground law status.  METHODS: Using a nationally representative survey of US adults in 2023, we asked firearm owners (n=2477) about their firearm motivations and behaviours, including reason(s) for ownership.

RESULTS

Of all firearm owners, 78.8% (95% CI 76.0% to 81.0%) owned a firearm for protection, and 58.1% (95% CI 54.3% to 62.0%) carried a firearm outside their home in the last 12 months. Firearm ownership for protection was not significantly associated with stand your ground laws, but firearm carriage was more prevalent in states with stand your ground laws (50.1% (95% CI 47.0% to 53.0%) vs 34.9% (95% CI 25.0% to 46.0%)). Gender (women) and race (minority groups) emerged as key correlates for firearm ownership for protection (vs other ownership motivations). For example, black and Asian women (98.8%) almost exclusively owned firearms for protection.

CONCLUSIONS

Protection was the dominant reason for firearm ownership in 2023, motivating 65 million Americans to own firearms and appealing to different strata of the population.

Why did US urban homicide spike in 2020? A cross-sectional data analysis for the largest American cities

Working with data about homicide victims and perpetrators from 50 of America's largest cities, we investigate the explanatory power of some familiar explanations for why murder in those cities rose sharply in 2020. The analysis reveals that the distribution of risk by race was essentially the same in 2020 as in 2019. That empirical finding challenges some theories of how racial tensions after the death of George Floyd may have driven homicide increases. Similarly, homicide growth was not concentrated in those cities with the greatest availability in 2020 of new and older guns, or among the cities that suffered the most from the COVID-19 pandemic. At a minimum, the cross-city outcomes should reduce confidence that some combination of "race, guns, and COVID-19" explains all of the most important aspects of what happened in 2020.

Firearm Access and Suicide Rates: An Unambiguously Robust Association

Firearms account for approximately half of all suicide deaths within the United States each year. Recently, Lane and Kleck published pieces reporting conflicting results regarding the relationship between firearm access and suicide rates. In this commentary, I aim to contextualize the findings within the broader literature and to provide clarity for readers aiming to navigate the findings of the two studies. Ultimately, I conclude that the results of Lane more accurately represent the nature of the relationship and align with the extant literature on the topic.

Firearm suicide risk beliefs and prevention: The role of fear of community violence and firearm ownership for protection

INTRODUCTION

Household firearm availability is a risk factor for firearm suicide when a household member at-risk for suicide. Firearm ownership for protection and perceptions of community violence may reduce the likelihood of limiting access to firearms as a way to prevent suicide. The association between a firearm suicide risk belief and the intention to reduce firearm access as a means of preventing suicide, with fear of community violence and firearm ownership for protection as moderators, was examined.

MATERIALS AND METHODS

The analytic sample consisted of 388 Missouri firearm owners from a cross-sectional, statewide survey of Missouri adults. Logistic regression models were estimated.

RESULTS

Among Missouri firearm owners, firearm suicide risk belief was positively associated with the intention of reducing firearm access for firearm owners who were not afraid of community violence and owned a firearm for non-protection reasons (e.g., hunting).

DISCUSSION

Findings suggest that firearm suicide prevention efforts must be tailored to address the underlying beliefs about their violence risk among firearm owners who indicate they principally own for protection.

Sample Size Planning in Quantitative Nursing Research

Editor's note: This is the 18th article in a series on clinical research by nurses. The series is designed to be used as a resource for nurses to understand the concepts and principles essential to research. Each column will present the concepts that underpin evidence-based practice-from research design to data interpretation. To see all the articles in the series, go to https://links.lww.com/AJN/A204.

Who bought a gun during the COVID-19 pandemic in the United States?: Associations with QAnon beliefs, right-wing political attitudes, intimate partner violence, antisocial behavior, suicidality, and mental health and substance use problems

There was a large spike in gun purchases and gun violence during the first year of the COVID-19 pandemic in the United States. We used an online U.S. national survey (N = 1036) to examine the characteristics of people who purchased a gun between March 2020 and October 2021 (n = 103) and compared them to non-gun owners (n = 763) and people who own a gun but did not purchase a gun during the COVID-19 pandemic (n = 170). Compared to non-gun owners, pandemic gun buyers were younger and more likely to be male, White race, and to affiliate with the Republican party. Compared to non-gun owners and pre-pandemic gun owners, pandemic gun buyers exhibited extreme elevations on a constellation of political (QAnon beliefs, pro-gun attitudes, Christian Nationalism, approval of former President Donald Trump, anti-vax beliefs, COVID-19 skepticism; mean Cohen's d = 1.15), behavioral (intimate partner violence, antisocial behavior; mean d = 1.38), mental health (suicidality, depression, anxiety, substance use; mean d = 1.21), and personality (desire for power, belief in a dangerous world, low agreeableness, low conscientiousness; mean d = 0.95) characteristics. In contrast, pre-pandemic gun owners only endorsed more pro-gun attitudes (d = 0.67), lower approval of President Joe Biden (d = -0.41) and were more likely to be male and affiliate with the Republican party relative to non-gun owners. Pandemic gun buyers represent an extreme group in terms of political and psychological characteristics including several risk-factors for violence and self-harm.

Associations between nonfatal firearm injuries and risk of subsequent suicide among Veteran VA users: A retrospective cohort study

BACKGROUND

Suicide is a leading cause of death in the United States, particularly among Veterans. Nonfatal firearm injuries may indicate subsequent risk of suicide and, thus, provide important opportunities for prevention in emergency departments and other health care settings. We used a retrospective cohort design to analyze associations between nonfatal firearm injuries and subsequent suicide among all Veterans who used U.S. Department of Veterans Affairs (VA) health care, nationally, between 2010 and 2019.

METHODS

We linked VA health care and mortality data to identify VA users, nonfatal firearm injuries, and deaths. International Classification of Diseases (ICD)-10th Revision cause-of-death codes were used to identify suicides. Veterans' firearm injuries and their intent were categorized using cause-of-injury codes from the ICD Clinical Modification-9th and 10th Revisions systems. Using bivariable and multivariable regression, we estimated risk of subsequent suicide among Veterans with, versus without, nonfatal firearm injuries. Among Veterans with nonfatal firearm injuries, we examined characteristics associated with subsequent suicide; electronic health record (chart) reviews explored documentation about firearm access among those who died.

RESULTS

Among 9,817,020 VA-using Veterans, 11,503 experienced nonfatal firearm injuries (64.9% unintentional, 12.3% intentional self-harm, 18.5% assault). Of these, 69 (0.6%) subsequently died by suicide (42 involving firearms). The odds of subsequent suicide among Veterans with, versus without, nonfatal firearm injuries were 2.4 (95% confidence interval 1.9-3.0); odds were only slightly attenuated in multivariable modeling. Among Veterans with nonfatal firearm injuries, those with depression or substance use disorder diagnoses had twice the odds of subsequent suicide than those without. Chart reviews identified small proportions of suicide decedents who were assessed for (21.7%), and/or counseled about (15.9%), firearm access.

CONCLUSIONS

Findings suggest that Veterans' nonfatal firearm injuries, regardless of injury intent, may be important but underutilized opportunities for suicide prevention. Future work should explore mechanisms to reduce risk among these patients.

Long gun suicides in the state of Maryland following the firearm safety act of 2013

OBJECTIVES

In 2013, the state of Maryland passed the Firearms Safety Act limiting the private sales of handguns, which did not apply to long guns often used for hunting (e.g., rifles and shotguns). This decreased the accessibility of handguns relative to long guns. We assessed the frequency of long gun suicides in the years before and after the policy change during winter season, which encompasses hunting season in Maryland.

METHODS

We performed a retrospective analysis on all 4107 well-characterized adult suicides caused by firearms in Maryland from 2003 through 2019. Logistic regression was performed, stratifying by decedent sex, race, and age.

RESULTS

While handgun suicides decreased in the period after 2013's Firearm Safety Act (p < 0.008), wintertime long gun suicides increased after 2013 (p < 0.004). Caucasian race (p < 0.006), male sex (p < 0.005), and middle age (p < 0.001) were significantly associated with wintertime long gun suicides after 2013.

CONCLUSION

Our findings suggest that while the 2013 Firearms Safety Act decreased handgun suicides significantly, it did not reduce long gun suicides and there may even have been replacement with long guns during hunting season, when rifles are out and accessible. This association was most prominent among the demographics most likely to hunt (Caucasian, middle-aged, and male).

Preventing the most common firearm deaths: Modifiable factors related to firearm suicide

BACKGROUND

More than 20,000 firearm suicides occur every year in America. Firearm restrictive legislation, firearm access, demographics, behavior, access to care, and socioeconomic metrics have been correlated to firearm suicide rates. Research to date has largely evaluated these contributors singularly. We aimed to evaluate them together as they exist in society. We hypothesized that state firearm laws would be associated with reduced firearm suicide rates.

METHODS

We acquired the 2013 to 2016 data for firearm suicide rates from The Centers for Disease Control Wide-ranging Online Data for Epidemiologic Research. Firearm laws were obtained from the State Firearms Law Database. Depression rates and access to care were obtained from the Behavioral Risk Factor Surveillance System and Occupational Employment and Wage Statistics program. Population demographics, poverty, and access to social support were obtained from the American Community Survey. Firearm access estimates were retrieved from the National Instant Criminal Background Check System. We used a univariate panel linear regression with fixed effect for state and firearm suicide rates as the outcome. We created a final multivariable model to determine the adjusted associations of these factors with firearm suicide rates.

RESULTS

In univariate analysis, firearm access, heavy drinking behavior, demographics, and access to care correlated to increased firearm suicide rates. The state proportion identifying as white and the proportion of those in poverty receiving food benefits correlated to decreased firearm suicide rates. In multivariable regression, only heavy drinking (β, 0.290; 95% confidence interval, 0.092-0.481; P = .004) correlated to firearm suicides rates increases.

CONCLUSIONS

During our study, few firearm laws changed. Heavy drinking behavior association with firearm suicide rates suggests an opportunity for interventions exists in the health care setting.

Suicide in Switzerland: why gun ownership can be deadly

There is a great deal of empirical evidence that owning a firearm increases the risk of dying from suicide. Most suicides are impulsive. Nearly 50% of survivors of suicide attempts report that they took less than 10 minutes between the decision to die and their suicide attempt. The great majority of these suicide survivors never make another attempt and die of natural causes. Because nearly 90% of firearm suicide attempts have a deadly outcome, gun owners are unlikely to have such a second chance. These impulsive suicide attempts are typically carried out with the means at hand. Swiss men have much higher firearm suicide rates than men in other European countries and this excess is likely to be due to their easy access to guns, because army conscripts have to keep their guns at home. When the number of conscripts was nearly halved in 2003/4 as a result of the Swiss Army Reform XXI, the number of army-issued firearms was reduced by an estimated 20%. An analysis of suicide rates before and after the reform indicated that male (but not female) suicide rates decreased by 8%, with no evidence of substitution with other means of suicide. If the army would require that the remaining half of conscripts had to keep their weapons at their barracks rather than at home, a further decrease in male suicide rates could be expected.

Achieving health equity in US suicides: a narrative review and commentary

Suicide rates in the United States (US) reached a peak in 2018 and declined in 2019 and 2020, with substantial and often growing disparities by age, sex, race/ethnicity, geography, veteran status, sexual minority status, socioeconomic status, and method employed (means disparity). In this narrative review and commentary, we highlight these many disparities in US suicide deaths, then examine the possible causes and potential solutions, with the overarching goal of reducing suicide death disparities to achieve health equity.The data implicate untreated, undertreated, or unidentified depression or other mental illness, and access to firearms, as two modifiable risk factors for suicide across all groups. The data also reveal firearm suicides increasing sharply and linearly with increasing county rurality, while suicide rates by falls (e.g., from tall structures) decrease linearly by increasing rurality, and suicide rates by other means remain fairly constant regardless of relative county urbanization. In addition, for all geographies, gun suicides are significantly higher in males than females, and highest in ages 51-85 + years old for both sexes. Of all US suicides from 1999-2019, 55% of male suicides and 29% of female suicides were by gun in metropolitan (metro) areas, versus 65% (Male) and 42% (Female) suicides by gun in non-metro areas. Guns accounted for 89% of suicides in non-metro males aged 71-85 + years old. Guns (i.e., employment of more lethal means) are also thought to be a major reason why males have, on average, 2-4 times higher suicide rates than women, despite having only 1/4-1/2 as many suicide attempts as women. Overall the literature and data strongly implicate firearm access as a risk factor for suicide across all populations, and even more so for male, rural, and older populations.To achieve the most significant results in suicide prevention across all groups, we need 1) more emphasis on policies and universal programs to reduce suicidal behaviors, and 2) enhanced population-based strategies for ameliorating the two most prominent modifiable targets for suicide prevention: depression and firearms.

Simulating the bounds of plausibility: Estimating the impact of high-risk versus population-based approaches to prevent firearm injury

BACKGROUND

Firearm violence remains a persistent public health threat. Comparing the impact of targeted high-risk versus population-based approaches to prevention may point to efficient and efficacious interventions. We used agent-based modeling to conduct a hypothetical experiment contrasting the impact of high-risk (disqualification) and population-based (price increase) approaches on firearm homicide in New York City (NYC).

METHODS

We simulated 800,000 agents reflecting a 15% sample of the adult population of NYC. Three groups were considered and disqualified from all firearm ownership for five years, grouped based on prevalence: low prevalence (psychiatric hospitalization, alcohol-related misdemeanor and felony convictions, 0.23%); moderate prevalence (drug misdemeanor convictions, domestic violence restraining orders, 1.03%); and high prevalence (all other felony/misdemeanor convictions, 2.30%). Population-level firearm ownership was impacted by increasing the price of firearms, assuming 1% price elasticity.

RESULTS

In this hypothetical scenario, to reduce firearm homicide by 5% in NYC, 25% of the moderate prevalence group, or 12% of the high prevalence group needed to be effectively disqualified; even when all of the low prevalence group was disqualified, homicide did not decrease by 5%. An 18% increase in price similarly reduced firearm homicide by 5.37% (95% CI 4.43-6.31%). Firearm homicide declined monotonically as the proportion of disqualified individuals increased and/or price increased. A combined intervention that both increased price and effectively disqualified "high-risk" groups achieved approximately double the reduction in homicide as any one intervention alone. Increasing illegal firearm ownership by 20%, a hypothetical response to price increases, did not meaningfully change results.

CONCLUSION

A key takeaway of our study is that adopting high-risk versus population-based approaches should not be an "either-or" question. When individual risk is variable and diffuse in the population, "high-risk approaches" to firearm violence need to focus on relatively prevalent groups and be highly efficacious in disarming people at elevated risk to achieve meaningful reductions in firearm homicide, though countering issues of social justice and stigma should be carefully considered. Similar reductions can be achieved with population-based approaches, such as price increases, albeit with fewer such countering issues.

The 5 A's of firearm safety counseling: Validating a clinical counseling methodology for firearms in a simulation-based randomized controlled trial

The 5 A's of Firearm Safety Counseling is a novel framework by which clinicians can approach firearm injury prevention counseling. To evaluate this methodology as a tool for clinicians, a single-center, simulation-based randomized controlled trial was performed with clinical trainees in psychiatry, medicine, and pediatrics in an urban quaternary care center. Participants received didactic education on firearm injury epidemiology and evidence-based policies and training on a specific counseling framework, the 5 A's of Firearm Safety Counseling which they then implemented in a simulation setting with standardized patients. Of the 29 participants who were randomized, 28 completed the trial. Most participants were psychiatry trainees (residents or subspecialty fellows). While over 60% of participants were uncomfortable or extremely uncomfortable counseling on firearm injury prior to the interventions, only 4% reported being uncomfortable after receiving education and participating in simulated encounters. There was no significant difference between the quality and content of the counseling provided before and after the didactic-only session. There was a significant difference between the quality and content of the counseling provided before and after the specific training on the 5 A's for Firearm Safety Counseling strategy. The 5 A's for Firearm Safety Counseling is a promising educational tool to improve quality, content, and comfort delivering patient-centered counseling on firearm injury prevention in a simulation-based setting. These findings suggest that further validation in a clinical setting is warranted given there is an urgent need for feasible and effective firearm injury prevention strategies among clinicians.

Suicide Deaths Among Women in California Living With Handgun Owners vs Those Living With Other Adults in Handgun-Free Homes, 2004-2016

Importance

Little is known about the extent to which secondhand exposure to household firearms is associated with risk of suicide in adults who do not own guns, most of whom are women.

Objective

To evaluate changes in risk of suicide among women living in gun-free households after one of their cohabitants became a handgun owner.

Design, Setting, and Participants

This cohort study observed participants for up to 12 years and 2 months from October 18, 2004, to December 31, 2016. Data were analyzed from April to November 2021. The study population included 9.5 million adult women in California who did not own guns and who entered the study while living with 1 or more adults in a handgun-free home.

Exposures

Secondhand exposure to household handguns.

Main Outcomes and Measures

Suicide, firearm suicide, nonfirearm suicide.

Results

Of 9.5 million women living in handgun-free homes, 331 968 women (3.5% of the study population; mean [SD] age, 41.6 [18.0] years) became exposed to household handguns during the study period. In the entire study population, 294 959 women died: 2197 (1%) of these were by suicide, 337 (15%) of which were suicides by firearm. Rates of suicide by any method during follow-up were higher among cohort members residing with handgun owners compared with those residing in handgun-free homes (hazard ratio, 1.43; 95% CI, 1.11-1.84). The excess suicide rate was accounted for by higher rates of suicide by firearm (hazard ratio, 4.32; 95% CI, 2.89-6.46). Women in households with and without handguns had similar rates of suicide by nonfirearm methods (hazard ratio, 0.90; 95% CI, 0.63-1.27).

Conclusions and Relevance

In this study, the rate of suicide among women was significantly higher after a cohabitant of theirs became a handgun owner compared with the rate observed while they lived in handgun-free homes.

Homicide Deaths Among Adult Cohabitants of Handgun Owners in California, 2004 to 2016 : A Cohort Study

BACKGROUND

Although personal protection is a major motivation for purchasing firearms, existing studies suggest that people living in homes with firearms have higher risks for dying by homicide. Distribution of those risks among household members is poorly understood.

OBJECTIVE

To estimate the association between living with a lawful handgun owner and risk for homicide victimization.

DESIGN

This retrospective cohort study followed 17.6 million adult residents of California for up to 12 years 2 months (18 October 2004 through 31 December 2016). Cohort members did not own handguns, but some started residing with lawful handgun owners during follow-up.

SETTING

California.

PARTICIPANTS

17 569 096 voter registrants aged 21 years or older.

MEASUREMENTS

Homicide (overall, by firearm, and by other methods) and homicide occurring in the victim's home.

RESULTS

Of 595 448 cohort members who commenced residing with handgun owners, two thirds were women. A total of 737 012 cohort members died; 2293 died by homicide. Overall rates of homicide were more than twice as high among cohabitants of handgun owners than among cohabitants of nonowners (adjusted hazard ratio, 2.33 [95% CI, 1.78 to 3.05]). These elevated rates were driven largely by higher rates of homicide by firearm (adjusted hazard ratio, 2.83 [CI, 2.05 to 3.91]). Among homicides occurring at home, cohabitants of owners had sevenfold higher rates of being fatally shot by a spouse or intimate partner (adjusted hazard ratio, 7.16 [CI, 4.04 to 12.69]); 84% of these victims were female.

LIMITATIONS

Some cohort members classified as unexposed may have lived in homes with handguns. Residents of homes with and without handguns may have differed on unobserved traits associated with homicide risk.

CONCLUSION

Living with a handgun owner is associated with substantially elevated risk for dying by homicide. Women are disproportionately affected.

PRIMARY FUNDING SOURCE

The National Collaborative on Gun Violence Research, the Fund for a Safer Future, the Joyce Foundation, Stanford Law School, and the Stanford University School of Medicine.

Firearm ownership, attitudes, and safe storage practices among a nationally representative sample of older U.S. adults age 50 to 80

Firearms are a leading cause of injury mortality across the lifespan, with elevated risks for older adult populations. To inform prevention efforts, we conducted a probability-based web survey (12/1/2019-12/23/2019) of 2048 older adults (age 50-80) to characterize national estimates of firearm ownership, safety practices, and attitudes about health screening, counseling, and policy initiatives. Among older U.S. adults, 26.7% [95%CI = 24.8%-28.8%] report owning one or more firearms. The primary motivation for ownership was protection (69.5%), with 90.4% highlighting a fear of criminal assault. 39.4% of firearm owners reported regularly storing firearm(s) unloaded and locked, with 24.2% regularly storing at least one loaded and unlocked. While most firearm owners found healthcare screening (69.2% [95%CI: 64.9-73.1]) and safety counseling (63.2% [95%CI = 58.8-67.3]) acceptable, only 3.7% of older adults reported being asked about firearm safety by a healthcare provider in the past year. Among firearm owners, there was support for state-level policy interventions, including allowing family/police to petition courts to restrict access when someone is a danger to self/others (78.9% [95%CI = 75.1-82.3]), comprehensive background checks (85.0% [95%CI = 81.5-87.9]), restricting access/ownership under domestic violence restraining orders (88.1%; 95%CI = 84.9-90.7], and removing firearms from older adults with dementia/confusion (80.6%; 95%CI = 76.8-84.0]. Healthcare and policy-level interventions maintained higher support among non-owners than owners (p's < 0.001). Overall, data highlights opportunities exist for more robust firearm safety prevention efforts among older adults, particularly healthcare-based counseling and state/federal policies that focus on addressing lethal means access among at-risk individuals.

Suicide typologies among Medicaid beneficiaries, North Carolina 2014-2017

BACKGROUND

There is a well-established need for population-based screening strategies to identify people at risk of suicide. Because only about half of suicide decedents are ever diagnosed with a behavioral health condition, it may be necessary for providers to consider life circumstances that may also put individuals at risk. This study described the alignment of medical diagnoses with life circumstances by identifying suicide typologies among decedents. Demographics, stressful life events, suicidal behavior, perceived and diagnosed health problems, and suicide method contributed to the typologies.

METHODS

This study linked North Carolina Medicaid and North Carolina Violent Death Reporting System (NC-VDRS) data for analysis in 2020. For suicide decedents from 2014 to 2017 aged 25-54 years, we analyzed 12 indicators of life circumstances from NC-VDRS and 6 indicators from Medicaid claims, using a latent class model. Separate models were developed for men and women.

RESULTS

Most decedents were White (88.3%), with a median age of 41, and over 70% had a health care visit in the 90 days prior to suicide. Two typologies were identified in both males (n = 175) and females (n = 153). Both typologies had similar profiles of life circumstances, but one had high probabilities of diagnosed behavioral health conditions (45% of men, 71% of women), compared to low probabilities in the other (55% of men, 29% of women). Black beneficiaries and men who died by firearm were over-represented in the less-diagnosed class, though estimates were imprecise (odds ratio for Black men: 3.1, 95% confidence interval: 0.8, 12.4; odds ratio for Black women: 5.0, 95% confidence interval: 0.9, 31.2; odds ratio for male firearm decedents: 1.6, 95% confidence interval: 0.7, 3.4).

CONCLUSIONS

Nearly half of suicide decedents have a typology characterized by low probability of diagnosis of behavioral health conditions. Suicide screening could likely be enhanced using improved indicators of lived experience and behavioral health.

Case-Control Studies

Editor's note: This is the eighth article in a series on clinical research by nurses. The series is designed to give nurses the knowledge and skills they need to participate in research, step by step. Each column will present the concepts that underpin evidence-based practice-from research design to data interpretation. The articles will be accompanied by a podcast offering more insight and context from the authors. To see all the articles in the series, go to https://links.lww.com/AJN/A204.

Talking about firearm injury prevention with patients: a survey of medical residents

BACKGROUND

Firearm injury and death are significant public health problems in the U.S. and physicians are uniquely situated to help prevent them. However, there is little formal training in medical education on identifying risk for firearm injury and discussing safe firearm practices with patients. This study assesses prior education, barriers to counseling, and needs for improved training on firearm safety counseling in medical education to inform the development of future education on clinical strategies for firearm injury prevention.

METHOD

A 2018 survey administered to 218 residents and fellows at a large, academic medical center asked about medical training on firearm injury prevention, frequency of asking patients about firearm access, and perceived barriers.

RESULTS

The most common barriers cited were not knowing what to do with patients' answers about access to firearms (72.1%), not having enough time (66.2%), not feeling comfortable identifying patients at-risk for firearm injury (49.2%), and not knowing how to ask patients about firearm access (48.6%). Prior education on firearm injury prevention was more strongly associated with asking than was personal exposure to firearms: 51.5% of respondents who had prior medical education reported asking compared with who had not received such education (31.8%, p=0.004). More than 90% of respondents were interested in further education about interventions, what questions to ask, and legal mechanisms to separate dangerous people from their firearms.

CONCLUSIONS

Education on assessing risk for firearm-related harm and, when indicated, counseling on safe firearm practices may increase the likelihood clinicians practice this behavior, though additional barriers exist.

Conducting density-sampled case-control studies using survey data with complex sampling designs: A simulation study

PURPOSE

Population-based surveys are possible sources from which to draw representative control data for case-control studies. However, these surveys involve complex sampling that could lead to biased estimates of measures of association if not properly accounted for in analyses. Approaches to incorporating complex-sampled controls in density-sampled case-control designs have not been examined.

METHODS

We used a simulation study to evaluate the performance of different approaches to estimating incidence density ratios (IDR) from case-control studies with controls drawn from complex survey data using risk-set sampling. In simulated population data, we applied four survey sampling approaches, with varying survey sizes, and assessed the performance of four analysis methods for incorporating survey-based controls.

RESULTS

Estimates of the IDR were unbiased for methods that conducted risk-set sampling with probability of selection proportional to survey weights. Estimates of the IDR were biased when sampling weights were not incorporated, or only included in regression modeling. The unbiased analysis methods performed comparably and produced estimates with variance comparable to biased methods. Variance increased and confidence interval coverage decreased as survey size decreased.

CONCLUSIONS

Unbiased estimates are obtainable in risk-set sampled case-control studies using controls drawn from complex survey data when weights are properly incorporated.

The timing of opportunities to prevent mass shootings: a study of mental health contacts, work and school problems, and firearms acquisition

Although it is important to know what public mass shooters have in common, it is also helpful to understand when different variables were present on their pathways to violence. This study explored the timing of key life events for the deadliest public mass shooters in the United States since Columbine (N = 14). Using data from official reports and supplementary sources, we found perpetrators' mental health contacts often began more than a decade before their mass shootings, and often ended more than a year before their attacks. Mental illness was typically a constant in their lives, not something that automatically caused them to attack. While treatment may help prevent some mass shootings, mental health professionals have limited influence over patients they have not recently seen. In turn, perpetrators' work and school problems also typically began long before their mass shootings, but these issues continued closer to their attacks. Employers and educators may therefore have an opportunity to intervene later in the process. Firearms acquisition often occurred in the final stages, after perpetrators were already interested in mass murder. Red flag laws and ERPOs which prohibit sales to explicitly dangerous individuals may therefore help reduce the prevalence of these attacks.

Home as the first site for suicide prevention: a Hong Kong experience

INTRODUCTION

There has been little research into at-home suicide cases globally, and particularly in Asian regions. This study aimed to investigate the differences in characteristics between suicide cases in Hong Kong that occurred at home and elsewhere; identify at-home suicide hotspots in the community and compare the differences in area-level characteristics between suicide hotspots and other areas.

METHODS

Suicide cases (2013-2017) were identified from Hong Kong Coroner's Court reports. Area-level socioeconomic data were retrieved from the 2016 Hong Kong census. Wilcoxon signed-rank tests, χ² tests and multiple logistic regression models were applied to compare differences in characteristics between people committing suicide at home and elsewhere. Global hotspot tests (Moran's I and Getis-Ord General G) and local analysis (Getis-Ord Gi*) identified at-home suicide community hotspots. The Wilcoxon signed-rank test was used to compare differences in area-level characteristics between at-home suicide hotspots and non-hotspots.

RESULTS

About 60% of suicide cases in Hong Kong occurred at home. Being female, widowed and/or living alone were significant predictors of at-home suicide cases. A U-shaped association between age and at-home suicide was identified, with 32 years of age being the critical turning point. An at-home suicide hotspot was identified in the north-western region of Hong Kong, which had lower median household income, higher income inequality and higher percentages of households with single elderly people, and new arrivals, compared with other areas.

CONCLUSION

Suicide prevention should start at home by restricting access to suicide methods. Community-based suicide prevention interventions with improvement of social services should target vulnerable members in identified suicide hotspots.

Firearm Practices, Perceptions of Safety, and Opinions on Injury Prevention Strategies Among California Adults

IMPORTANCE

Safe firearm storage and other interventions may reduce pediatric firearm deaths and injuries.

OBJECTIVE

To compare firearm ownership and storage practices, opinions on firearm injury prevention strategies, and perceptions of safety among adults in California households with and without children and/or adolescents.

DESIGN, SETTING, AND PARTICIPANTS

This survey study used data from the 2018 California Safety and Well-being Survey, a California-representative, probability-based internet survey. Respondents were part of the Ipsos KnowledgePanel, an online research panel that uses address-based sampling and provides survey weights to produce estimates representative of the adult population of California.

MAIN OUTCOMES AND MEASURES

Topics included firearm storage practices, opinions on interventions to reduce pediatric firearm injury, and perceptions of household safety related to firearm ownership. Respondents were stratified by firearm ownership and household presence or absence of children and/or adolescents. Weighted percentages and 95% CIs are presented.

RESULTS

Of 5232 invited panel members, 2558 (48.9%) completed the survey. Among respondents, 52.5% (95% CI, 49.3%-55.7%) were women, 42.9% (95% CI, 39.9%-45.9%) were White, 30.0% (95% CI, 26.8%-32.9%) lived in homes with children, and the mean (SD) age was 48.0 (17.1) years. Among those in homes with children, more than two-thirds of individuals who owned firearms (70.6% [95% CI, 50.1%-85.2%]) and more than half of individuals who did not own firearms but lived in homes with guns (54.9% [95% CI, 37.9%-70.8%]) reported that they believed a firearm in the home made it safer. Half of those who owned firearms (52.3% [95% CI, 34.9%-69.2%]) and more than three-quarters of individuals who did not own firearms but lived in homes with guns (78.4% [95% CI, 57.5%-90.7%]) reported it was always appropriate for parents to inquire about unlocked guns in homes where their children play. Among those who had previously owned at least 1 gun but no longer did, 13.3% (95% CI, 7.1%-23.8%) reported getting rid of guns at least in part due to concern for the safety of a child in the home. Nearly two-thirds of those who owned firearms living with children and/or adolescents (64.5% [95% CI, 46.5%-79.2%]) did not store all firearms in the most secure manner (ie, unloaded and locked up), compared with 36.4% (95% CI, 29.4%-44.1%) of individuals who owned firearms but did not live with children.

CONCLUSIONS AND RELEVANCE

In this study, although a substantial percentage of individuals who owned guns and lived with children did not store all firearms as recommended, parents and caregivers who owned firearms reported being amenable to interventions that reduce young people's risk of firearm-related harm. Future work should investigate acceptable risk reduction and safe storage interventions.

Rural Communities and Violence

Among US geographic regions classified as rural, death rates are significantly higher for children and teens as compared with their urban peers; the disparity is even greater for Alaskan Native/American Indian and non-Hispanic black youth. Violence-related injuries and death contribute significantly to this finding. This article describes the epidemiology of violence-related injuries, with a limited discussion on child abuse and neglect and an in-depth analysis of self-inflicted injuries including unintentional firearm injuries and adolescent suicide. Potential interventions are also addressed, including strategies for injury prevention, such as firearm safe storage practices.

Beyond Band-Aids for Bullet Holes: Firearm Violence As a Public Health Priority

OBJECTIVES

To review the public health approach to preventing and treating firearm violence.

DATA SOURCES

Peer-reviewed, published scholarship and federal data systems.

STUDY SELECTION

English-language, indexed research articles on the epidemiology, risk, prevention, and consequences of firearm violence.

DATA EXTRACTION

This narrative review includes findings related to the epidemiology and impact of firearm violence, focusing on short- and long-term outcomes. Evidence supporting interventions at the individual, agent, and environmental level to reduce firearm-related harm was examined.

DATA SYNTHESIS

Firearm violence is a major public health challenge in the Unites States. The consequences of firearm violence reach beyond the nearly 40,000 firearm-related deaths and 90,000 firearm-related injuries each year. Firearm violence, including self-harm, assault, and unintentional injury, affects the health of individuals, families, communities, and health systems. Data sources remain inadequate, however, to fully capture these impacts. Treating firearm violence as a disease and taking a public health approach to prevention and treatment is key to reducing the harms of firearm violence. Using a public health framework not only recognizes the physical and mental consequences of firearm violence but also focuses our attention on underlying causes and on innovative, multi-level interventions to reduce the harms of firearm violence.

CONCLUSIONS

The public health approach positions clinicians to change the conversation from political diatribe of pro-gun and anti-gun to systematically reducing injury and death. To achieve comparable success, we must design, test, and implement effective interventions at the environmental, policy, technological, and individual levels to prevent firearm violence. We must collect robust data on firearm violence and its consequences. And we must reckon with the conditions of inequality and disadvantage that feed violence through all means.

Veterans, Firearms, and Suicide: Safe Storage Prevention Policy and the PREVENTS Roadmap

BACKGROUND

US veterans die by suicide at a higher rate than that of the civilian population and are more likely to use a firearm as their method. Systemic efforts to address the use of firearms in suicide had been largely evaded. In June 2020, the White House published the Roadmap to Empower Veterans and End the National Tragedy of Suicide (PREVENTS) task force report, which verified the link between, and the need to address, at-risk veterans and their access to firearms. This paper reviews the literature on the intersection of veterans, firearms, and suicide, then explores existing VA prevention initiatives aimed at reducing at-risk veterans' access to lethal means and offers policy recommendations to expand efforts in the context of the PREVENTS Roadmap.

OBSERVATIONS

The PREVENTS report recommends widespread distribution of safety education materials that encourage at-risk individuals to temporarily transfer or store their guns safely and the expansion of free or affordable options for storing weapons. Recommended policy actions to accomplish this goal include delaying access to firearms for at-risk veterans, facilitating temporary storage out of the home, improving in-home safe storage options, requiring that health care providers who care for high-risk veterans are trained in lethal means safety counseling, and creating campaigns to shift cultural norms for firearms' storage during crises.

CONCLUSIONS

Suicide prevention requires a multimodal approach, and attention to firearms access must become a more salient component. The high rate of veteran suicides involving firearms requires far-reaching interventions at societal, institutional, community, family, and individual levels.

Handgun Ownership and Suicide in California

BACKGROUND

Research has consistently identified firearm availability as a risk factor for suicide. However, existing studies are relatively small in scale, estimates vary widely, and no study appears to have tracked risks from commencement of firearm ownership.

METHODS

We identified handgun acquisitions and deaths in a cohort of 26.3 million male and female residents of California, 21 years old or older, who had not previously acquired handguns. Cohort members were followed for up to 12 years 2 months (from October 18, 2004, to December 31, 2016). We used survival analysis to estimate the relationship between handgun ownership and both all-cause mortality and suicide (by firearm and by other methods) among men and women. The analysis allowed the baseline hazard to vary according to neighborhood and was adjusted for age, race and ethnic group, and ownership of long guns (i.e., rifles or shotguns).

RESULTS

A total of 676,425 cohort members acquired one or more handguns, and 1,457,981 died; 17,894 died by suicide, of which 6691 were suicides by firearm. Rates of suicide by any method were higher among handgun owners, with an adjusted hazard ratio of 3.34 for all male owners as compared with male nonowners (95% confidence interval [CI], 3.13 to 3.56) and 7.16 for female owners as compared with female nonowners (95% CI, 6.22 to 8.24). These rates were driven by much higher rates of suicide by firearm among both male and female handgun owners, with a hazard ratio of 7.82 for men (95% CI, 7.26 to 8.43) and 35.15 for women (95% CI, 29.56 to 41.79). Handgun owners did not have higher rates of suicide by other methods or higher all-cause mortality. The risk of suicide by firearm among handgun owners peaked immediately after the first acquisition, but 52% of all suicides by firearm among handgun owners occurred more than 1 year after acquisition.

CONCLUSIONS

Handgun ownership is associated with a greatly elevated and enduring risk of suicide by firearm. (Funded by the Fund for a Safer Future and others.).

The Role of Reason for Firearm Ownership in Beliefs about Firearms and Suicide, Openness to Means Safety, and Current Firearm Storage

OBJECTIVE

Firearm means safety strategies, such as safe storage, are effective in reducing suicide rates but are not widely implemented in the United States. This study examined the association between reason for firearm ownership, beliefs about firearm ownership and storage and suicide risk, willingness to engage in means safety, and current firearm storage practices.

METHOD

A sample of 300 American firearm owners (53.0% male; 82.3% White; M_age  = 36.11, age range = 20-69) completed an online survey via Amazon's Mechanical Turk (mTurk) program.

RESULTS

Firearm owners who own a firearm for protection, compared to owning a firearm for other reasons, (1) endorsed decreased belief in the relationship between firearm ownership and storage and suicide risk, (2) were less willing to engage in the means safety measures of storing firearms safely and allowing a trusted individual to temporarily remove firearms from the home, and (3) were more likely to store their firearms loaded.

CONCLUSIONS

Reason for firearm ownership influences views regarding firearms and suicide, willingness to engage in firearm means safety, and firearm storage practices. It is essential to understand how differences in reason for firearm ownership impact these outcomes so appropriate, efficacious messaging can be developed and implemented.

Partnering With Patients to Reduce Firearm-Related Death and Injury

In the United States, nearly 40,000 deaths per year are firearm related. Among these fatalities are approximately 1300 children. In addition, there are more than 20,000 unintentional firearm injuries per year. Osteopathic physicians have a unique opportunity to affect this public health concern through patient education. Several evidenced-based recommendations can be incorporated at the bedside to reduce firearm injuries and deaths, including gun education, safe storage, and proper disposal.

Evaluation of Prevention Efforts and Risk Factors Among Veteran Suicide Decedents Who Died by Firearm

OBJECTIVE

Veterans die by suicide at a higher rate than the U.S. population, and veterans more frequently use a firearm as the suicide method. Consequently, firearm accessibility and storage represent important prevention considerations. This project aimed to explore the implementation of suicide prevention efforts among veterans who went on to die by suicide, with and without the use of a firearm, and to identify factors that differentiated veteran suicide decedents to help inform suicide prevention efforts.

METHODS

Data from the Veteran Health Administration Behavior Health Autopsy Program was analyzed for 97 veteran suicide decedents.

RESULTS

Results demonstrated that veterans who used a firearm for suicide were less likely to have engaged in suicide prevention efforts overall and were less likely to have received lethal means safety counseling / safety planning. Veterans who died by firearm had lower levels of notable risk factors (e.g., prior suicide attempt, no-shows for appointments), however were more likely to have a documented unsecured firearm in their home.

CONCLUSION

These findings support the benefit of broadening the reach of suicide prevention efforts, especially for high-risk veterans with access to firearms.

Medical Marijuana Laws and Suicide

In the current study we use a synthetic control group design to estimate the causal effect of a medical marijuana initiative on suicide risk. In 1996, California legalized marijuana use for medical purposes. Implementation was abrupt and uniform, presenting a "natural experiment." Utilizing a panel dataset containing annual frequencies of Total, gun, and non-gun suicides aggregated by state for the years 1970-2004, we construct a control time series for California as a weighted combination of the 41 states that did not legalize marijuana during the analysis period. Post-intervention differences for California and its constructed control time series can be interpreted as the effects of the medical marijuana law on suicide. Significance of the effects were assessed with permutation tests. Our findings suggest that California's 1996 legalization resulted in statistically significant (p<.05) reductions in suicides and gun suicides, but only a non-significant reduction in non-gun suicides (p≥.488). Since the effect for non-gun suicides was indistinguishable from chance, we infer that the overall causal effect was realized through gun suicides. The mechanism could not be determined, however. Participation in the medical marijuana program legally disqualifies participants from purchasing guns. But since most suicides involve guns, it is possible that the effect on total suicide is driven by gun suicide alone.

Prevalence of long gun use in Maryland firearm suicides

BACKGROUND

Firearms account for the majority of US suicides, largely due to lethality and accessibility. Under Federal and Maryland law, long guns are less regulated than handguns which is a concern for increased suicide risk. This study uses Maryland data to ascertain the impact of long guns on suicides in the state. We hypothesize that the prevalence of long gun use among firearm suicides will be increased in rural and young populations.

METHODS

This is a cross sectional study using police and medical examiner narratives to identify firearm type involved in all 3931 Maryland gun suicides from 2003 to 2018. Proportions of firearm suicides utilizing long guns were calculated. Urban-rural differences were determined using the National Center for Health Statistics' classification system. Logistic regression was used to calculate odds ratios of long gun to handgun suicides across the urban-rural spectrum, controlling for decedent demographics.

RESULTS

From 2003 to 2018, 28.4% of Maryland gun suicides used long guns. The proportion of long guns used was highest in the most rural counties, where 51.6% of firearm suicides were by long gun, compared to 16.8% in the most urban counties. Long guns were disproportionately used by the young. For decedents 18 or younger, 44.6% used long guns, compared to 20.2% in those 65 or older. Compared to the most urban counties, firearm suicide decedents in the most rural counties were 3.74x more likely to use long guns (OR = 3.74; 95% CI 2.19, 6.40; p < .001) after adjusting for demographics, intoxication, and hunting season.

CONCLUSIONS

Long guns are used in a large proportion of Maryland firearm suicides, particularly in rural areas and disproportionately in youth suicides. Long guns must be considered as part of access to lethal means or policy strategies in efforts to reduce the burden of firearm suicide.

Firearm storage practices in households with children: A survey of community-based firearm safety event participants

Safe firearm storage is associated with lower risk of unintentional and intentionally self-inflicted firearm injuries among children and adolescents. Ten community-based firearm safety events were conducted across Washington state from 2015 to 2018. We sought to describe characteristics of event participants and assess whether presence and age of children in the household were associated with household firearm locking practices. We assessed demographic characteristics and baseline firearm storage behaviors of participants using a 13-item survey. Multivariable Poisson regression models were used to estimate prevalence ratios (PR) and corresponding confidence intervals (CI) for the association of presence and age of children in households with prevalence of storing a household firearm unlocked. Of 2956 participants, 58.3% were male and 57.9% lived with an individual under 18 years. Among the 89.8% participants living with firearms, 40.1% stored at least one firearm unlocked and 39.1% stored at least one firearm loaded. In adjusted analyses, there was no statistically significant difference in prevalence of storing a household firearm unlocked between those living with no children (reference group) and those living with a child <11 years (PR = 0.91; 95% CI: 0.80,1.04), or a child aged 11-18 years (PR = 0.94; 95% CI: 0.81,1.09). A high proportion of participants stored a firearm unlocked or loaded at home and neither living with young children nor adolescents was associated with safe locking practices. In comparison with firearm safety interventions conducted in clinic settings, a majority of the participants in these community-based interventions were male and owned firearms.

The relationship between alcohol consumption and the desire to own a firearm: an empirical study on citizens of São Paulo city, Brazil

OBJECTIVE

The main objective of this study was to investigate the association between alcohol consumption (use and bingeing) and the desire to own a firearm for protection.

STUDY DESIGN

We used data from three random cross-sectional victimisation surveys conducted in São Paulo city, Brazil, in 2003, 2008 and 2013 with people aged ≥16 years.

METHODS

We performed tests for equality of proportions. Our analysis was performed separately for each victimisation survey to check the robustness of the results. We also used probit models, estimated by the maximum likelihood method, to analyse the relationship between desire to own a firearm and alcohol consumption, controlling for many other variables.

RESULTS

In 2013, although only 1.5% of the population surveyed reported living in a household with a firearm, 15.7% report that they would possess a firearm if they could, and 13.0% believed they would be safer/more protected from violence if they had a firearm. The desire to own a firearm is higher among people who consume alcoholic beverages than among those who do not and is higher as alcohol binge frequency increases.

CONCLUSION

In São Paulo city, alcohol consumption and binge drinking are positively associated with the desire to own a firearm.

Assembly of the LongSHOT cohort: public record linkage on a grand scale

BACKGROUND

Virtually all existing evidence linking access to firearms to elevated risks of mortality and morbidity comes from ecological and case-control studies. To improve understanding of the health risks and benefits of firearm ownership, we launched a cohort study: the Longitudinal Study of Handgun Ownership and Transfer (LongSHOT).

METHODS

Using probabilistic matching techniques we linked three sources of individual-level, state-wide data in California: official voter registration records, an archive of lawful handgun transactions and all-cause mortality data. There were nearly 28.8 million unique voter registrants, 5.5 million handgun transfers and 3.1 million deaths during the study period (18 October 2004 to 31 December 2016). The linkage relied on several identifying variables (first, middle and last names; date of birth; sex; residential address) that were available in all three data sets, deploying them in a series of bespoke algorithms.

RESULTS

Assembly of the LongSHOT cohort commenced in January 2016 and was completed in March 2019. Approximately three-quarters of matches identified were exact matches on all link variables. The cohort consists of 28.8 million adult residents of California followed for up to 12.2 years. A total of 1.2 million cohort members purchased at least one handgun during the study period, and 1.6 million died.

CONCLUSIONS

Three steps taken early may be particularly useful in enhancing the efficiency of large-scale data linkage: thorough data cleaning; assessment of the suitability of off-the-shelf data linkage packages relative to bespoke coding; and careful consideration of the minimum sample size and matching precision needed to support rigorous investigation of the study questions.

Type of Firearm Used in Suicides: Findings From 13 States in the National Violent Death Reporting System, 2005-2015

PURPOSE

Although household firearm ownership has been consistently associated with increased suicide rates in the U.S., scant data speak to the type of gun used in U.S. suicides. We address this research gap using data from the National Violent Death Reporting System Restricted Access Data Set, 2005-2015, by describing the types of guns used in firearm suicides over time, by urban versus rural residence, for the population as a whole, and separately among adolescents, and by sex, race, and age.

METHODS

The types of firearm used by 44,540 firearm suicide decedents in 13 states from 2005 to 2015 are based on individual-level data from the National Violent Death Reporting System and urban-rural classification schemes from the National Center for Health Statistics. Rates are calculated using population data from the National Center for Health Statistics' CDC WONDER online database.

RESULTS

Between 2005 and 2015, suicide rates by handguns, but not long guns, increased markedly in both urban and rural counties. Among adolescents, handgun suicide rates doubled over the study period in both rural and urban areas; long gun suicide rates increased modestly. Although handguns were used in nearly three fourths of firearm suicides for the population as a whole, long gun use was relatively higher in rural counties and among adolescents. In rural counties, long guns were used in 51% of adolescent male suicides.

CONCLUSIONS

Suicide prevention efforts that advise gun-owning families to reduce access to household firearms should focus not only on handguns but also on long guns, especially in rural areas and among households with adolescents.

Association of Firearm Ownership, Use, Accessibility, and Storage Practices With Suicide Risk Among US Army Soldiers

Importance

Since 2004, the suicide rate among US Army soldiers has exceeded the rate of death from combat injury. It is critical to establish factors that increase the risk of acting on suicidal thoughts to guide early intervention and suicide prevention.

Objective

To assess whether firearm ownership, use, storage practices, and accessibility are associated with increased risk of suicide.

Design, Setting, and Participants

In this case-control study, suicide cases (n = 135) were defined as US Army soldiers who died by suicide while on active duty between August 1, 2011, and November 1, 2013. Next-of-kin and Army supervisors of soldiers who died by suicide (n = 168) were compared with propensity-matched controls (n = 137); those soldiers with a suicidal ideation in the past year (n = 118) provided structured interview data. Data were analyzed from April 5, 2018, to April 2, 2019.

Main Outcomes and Measures

Firearm ownership, storage, and accessibility were assessed by using items from the World Health Organization Composite International Diagnostic Interview screening scales along with items created for the purpose of the Army Study to Assess Risk and Resilience in Servicemembers (Army STARRS) study.

Results

Among the 135 suicide decedents, next-of-kin reported that they had greater accessibility to firearms compared with propensity-matched controls. Specifically, suicide decedents were more likely to own 1 or more handguns compared with propensity-matched controls (odds ratio [OR], 1.9; 95% CI, 1.0-3.7; χ21 = 4.2; false discovery rate [FDR] P = .08), store a loaded gun at home (OR, 4.1; 95% CI, 1.9-9.1; χ21 = 12.2; FDR P = .003), and publicly carry a gun when not required for military duty (OR, 3.2; 95% CI, 1.4-7.3; χ21 = 7.4; FDR P = .02). The combination of these 3 items was associated with a 3-fold increase in the odds of suicide death (OR, 3.4; 95% CI, 1.2-9.4; χ21 = 5.4; FDR P = .05). Storing a loaded gun with ammunition at home or publicly carrying a gun when not on duty was associated with a 4-fold increase in the odds of suicide death (OR, 3.9; 95% CI, 1.9-7.9; χ21 = 14.1; FDR P = .002).

Conclusions and Relevance

In this study, in addition to gun ownership, ease and immediacy of firearm access were associated with increased suicide risk. Discussion with family members and supervisors about limiting firearm accessibility should be evaluated for potential intervention.

Preventing Firearm-Related Death and Injury

Deaths and injuries from firearms are significant public health problems, and clinicians are in a unique position to identify risk among their patients and discuss the importance of safe firearm practices. Although clinicians may be ill-prepared to engage in such discussions, an adequate body of evidence is available for support, and patients are generally receptive to this type of discussion with their physician. Here, we provide an overview of existing research and recommended strategies for counseling and intervention to reduce firearm-related death and injury.

Identifying and Addressing Confounding Bias in Violence Prevention Research

Purpose of review

Violence prevention research has enhanced our understanding of individual and community risk and protective factors for aggression and violence. However, our knowledge of risk and protective factors for violence is highly dependent on observational studies, since there are few randomized trials of risk and protective factors for violence. Observational studies are susceptible to systematic errors, specifically confounding, and may lack internal validity.

Recent findings

Many violence prevention studies utilize methods that do not correctly identify the set of covariates needed for statistical adjustment. This results in unwarranted matching and restriction leading to further confounding or selection bias. Covariate adjustment based on purely statistical criteria generates inconsistent results and uncertain conclusions.

Summary

Conventional methods used to identify confounding in violence prevention research are often inadequate. Causal diagrams have potential to improve the understanding and identification of potential confounding biases in observational violence prevention studies, and methods like sensitivity analysis using quantitative bias analysis can help to address unmeasured confounding. Violence research studies should make more use of these methods.

Firearms training and storage practices among US gun owners: a nationally representative study

OBJECTIVES

To describe firearm storage practices among US adults and examine the relationship between having received formal firearms training and firearm storage.

METHODS

In 2015 we asked a nationally representative online sample of 2072 gun owners how they stored household firearms, their reasons for owning guns, the number and types owned, had they carried a loaded handgun in the prior month and whether they had formal firearms training (and if so, whether training covered suicide prevention, accident prevention, firearm theft prevention, safe handling and safe storage). Unadjusted associations between gun owner characteristics and storage practices were estimated using Pearson's χ² tests; adjusted associations used multivariate logistic regressions. Final survey weights that combined presample and study-specific poststratification weights account for oversampling of firearm owners and survey non-response.

RESULTS

29.7% (95% CI 27.4% to 32.1%) stored ≥1 firearm loaded and unlocked. Of the 61.4% (95% CI 58.9% to 63.9%) of gun owners with firearms training, 32.3% (95% CI 29.4% to 35.3%) stored ≥1 firearm loaded and unlocked, compared with 25.8% (95% CI 22.3% to 29.7%) of those without training. Storage did not differ by training component, age, sex or race. However, firearms were more likely stored loaded and unlocked when respondents owned for protection, owned >1 firearm, owned handguns or carried a loaded gun. After adjusting for firearm-related characteristics, firearms training was not associated with storing firearms loaded and unlocked (adjusted OR=1.11, 95% Cl 0.80 to 1.53).

CONCLUSION

Firearms training, as currently provided, is unlikely to reduce unsafe firearm storage.

An Evaluation of the Counseling on Access to Lethal Means (CALM) Training with an Area Agency on Aging

Firearms are a significant risk factor in suicide and older adults are disproportionately impacted in suicide by this means. This study investigated the impact of Counseling on Access to Lethal Means (CALM) training with geriatric case managers at an Area Agency on Aging. A concurrent mixed methods approach was used to explore 1) geriatric case managers' attitudes, beliefs, and behavioral intentions about counseling on access to lethal means following CALM training, and 2) perceived barriers to assessing for suicidality and counseling clients on access to firearms. The CALM evaluation data was collected immediately posttest at CALM training, at three-month follow up. Results indicated that 38% of respondents reported they had, since CALM training, discussed reducing access to lethal means with clients and/or families. At three-month follow up, data showed that most beliefs, attitudes, and behavioral intentions about counseling clients and families on this topic increased. Focus group findings indicated that training had a positive effect on participants' attitudes, beliefs, and behavioral intentions about counseling on access to lethal means.The findings of the present study offer additional evidence and implication for trainings of this type.

Acceptability of potential interventions to increase firearm safety among patients in VA mental health treatment

OBJECTIVE

Veterans in mental health care have high rates of firearm-related suicide; reducing firearm access during high-risk periods could save lives. We assessed veteran patients' attitudes towards voluntary interventions to reduce access.

METHODS

Descriptive data came from surveys mailed to random samples of veterans receiving mental health care in five geographically diverse VA facilities. Survey items inquired about the acceptability of seven voluntary health system interventions to address firearm access, ranging from lower-intensity interventions that addressed safety but might not reduce access (i.e., clinician screening; distribution of gunlocks) to interventions substantially limiting access (i.e., storage of firearms offsite; gun disposal). Mailings occurred between 5/11/15 and 10/19/15; 677 of 1354 veterans (50%) returned the surveys.

RESULTS

93.2% of respondents endorsed one or more health system interventions addressing firearm access; 75.0% endorsed interventions substantially limiting access. Although veterans with household firearms were less likely to endorse interventions, fully 50.4% would personally participate in at least one intervention that substantially limited access.

DISCUSSION

A majority of veterans in VA mental health care endorse voluntary health system interventions addressing firearm access during high-risk periods for suicide. Approximately half of veterans with firearms would personally participate in an intervention that substantially limited firearm access.

Exposure to Genocide as a Risk Factor for Homicide Perpetration in Rwanda: A Population-Based Case-Control Study

A population-based case-control study was conducted to assess the relationship between genocide exposure and homicide perpetration in Rwanda. A sample of 150 homicide perpetrators who were charged with and confessed to having committed homicide between 1 May 2011 and 31 May 2013 and 450 controls were enrolled. Cases were matched to controls by neighborhood, age and sex. Socio-demographic, background and genocide-related information was collected from study subjects' next of kin. Four characteristics of genocide exposure were: genocide survivor, genocide perpetrator, having lost a first-degree relative to genocide and having a first-degree relative convicted of genocide. We assessed the impact of each genocide-exposure variable using conditional logistic regression. Of the 150 cases, 124 (82.7%) were male and 26 (17.3%) were female. The mean age of the alleged homicide perpetrators was 33 years, with a peak in the age group 20-29 years (39.3%). After adjusting for socio-demographic characteristics and past common criminal records, having a first-degree relative who had been convicted of genocide crimes was a significant predictor for homicide perpetration (odds ratio [OR] = 14.4, 95% confidence interval [CI] = 1.6-129.4). Being a genocide perpetrator, a genocide survivor and having lost a first-degree family member to genocide were not identified as risk factors for homicide perpetration. In Rwanda, young people who experienced early exposure to trauma by witnessing their first-degree relatives' active participation in the genocide, are more likely to commit homicide. Socio-economic and psychotherapeutic programs targeting this population group are needed to rehabilitate these young people for violent behavior change.

Firearm Storage in Gun-Owning Households with Children: Results of a 2015 National Survey

Data from a nationally representative probability-based online survey sample of US adults conducted in 2015 (n = 3949, response rate 55%) were used to assess self-reported gun storage practices among gun owners with children. The presence of firearms and children in the home, along with other household and individual level characteristics, was ascertained from all respondents. Questions pertaining to household firearms (how guns are stored, number, type, etc.) were asked only of those respondents who reported that they personally owned a gun. We found that approximately one in three US households contains at least one firearm, regardless of whether children lived in the home (0.34 [0.29-0.39]) or not (0.35 [0.32-0.38]). Among gun-owning households with children, approximately two in ten gun owners store at least one gun in the least safe manner, i.e., loaded and unlocked (0.21 [0.17-0.26]); three in ten store all guns in the safest manner, i.e., unloaded and locked (0.29, [0.24-0.34]; and the remaining half (0.50 [0.45-0.55]) store firearms in some other way. Although firearm storage practices do not appear to vary across some demographic characteristics, including age, sex, and race, gun owners are more likely to store at least one gun loaded and unlocked if they are female (0.31 [0.23-0.41]) vs. male (0.17 [0.13-0.22]); own at least one handgun (0.27 [0.22-0.32] vs. no handguns (0.05 [0.02-0.15]); or own firearms for protection (0.29 [0.24-0.35]) vs. do not own for protection (0.03 [0.01-0.08]). Approximately 7% of US children (4.6 million) live in homes in which at least one firearm is stored loaded and unlocked, an estimate that is more than twice as high as estimates reported in 2002, the last time a nationally representative survey assessed this outcome. To the extent that the high prevalence of children exposed to unsafe storage that we observe reflects a secular change in public opinion towards the belief that having a gun in the home makes the home safer, rather than less safe, interventions that aim to make homes safer for children should address this misconception. Guidance alone, such as that offered by the American Academy of Pediatrics, has fallen short. Our findings underscore the need for more active and creative efforts to reduce children's exposure to unsafely stored firearms.

State Firearm Laws and Interstate Firearm Deaths From Homicide and Suicide in the United States: A Cross-sectional Analysis of Data by County

IMPORTANCE

Firearm laws in one state may be associated with increased firearm death rates from homicide and suicide in neighboring states.

OBJECTIVE

To determine whether counties located closer to states with lenient firearm policies have higher firearm death rates.

DESIGN, SETTING, AND PARTICIPANTS

This cross-sectional study of firearm death rates by county for January 2010 to December 2014 examined data from the US Centers for Disease Control and Prevention for firearm suicide and homicide decedents for 3108 counties in the 48 contiguous states of the United States.

EXPOSURES

Each county was assigned 2 scores, a state policy score (range, 0-12) based on the strength of its state firearm laws, and an interstate policy score (range, -1.33 to 8.31) based on the sum of population-weighted and distance-decayed policy scores for all other states. Counties were divided into those with low, medium, and high home state and interstate policy scores.

MAIN OUTCOMES AND MEASURES

County-level rates of firearm, nonfirearm, and total homicide and suicide. With multilevel Bayesian spatial Poisson models, we generated incidence rate ratios (IRR) comparing incidence rates between each group of counties and the reference group, counties with high home state and high interstate policy scores.

RESULTS

Stronger firearm laws in a state were associated with lower firearm suicide rates and lower overall suicide rates regardless of the strength of the other states' laws. Counties with low state scores had the highest rates of firearm suicide. Rates were similar across levels of interstate policy score (low: IRR, 1.34; 95% credible interval [CI], 1.11-1.65; medium: IRR, 1.36, (95% CI, 1.15-1.65; and high: IRR, 1.43; 95% CI, 1.20-1.73). Counties with low state and low or medium interstate policy scores had the highest rates of firearm homicide. Counties with low home state and interstate scores had higher firearm homicide rates (IRR, 1.38; 95% CI, 1.02-1.88) and overall homicide rates (IRR, 1.32; 95% CI, 1.03-1.67). Counties in states with low firearm policy scores had lower rates of firearm homicide only if the interstate firearm policy score was high.

CONCLUSIONS AND RELEVANCE

Strong state firearm policies were associated with lower suicide rates regardless of other states' laws. Strong policies were associated with lower homicide rates, and strong interstate policies were also associated with lower homicide rates, where home state policies were permissive. Strengthening state firearm policies may prevent firearm suicide and homicide, with benefits that may extend beyond state lines.