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.

Suicide mortality varies widely across age, sex, race, and geography, far more than does mortality from the leading causes of natural death. Unlike the tight correlation between cancer mortality and the incidence of cancer, suicide mortality is only modestly correlated with the incidence of suicidal acts and other established risk factors for suicidal behavior, such as major psychiatric disorders. An implication of this modest correlation is that the proportion of all suicidal acts that prove fatal (the case fatality ratio) must account for a substantial portion of the (nonrandom) variation observed in suicide mortality. In the United States, the case fatality ratio is strongly related to the availability of household firearms. Findings from ecologic and individual-level studies conducted over the past two decades illustrate the importance of accounting for the availability of highly lethal suicide methods in efforts to understand (and ultimately reduce) disparities in suicide mortality across populations.

Most research regarding posttraumatic stress disorder (PTSD) and suicide has focused on suicidal ideation or attempts; no known study of the association between PTSD and completed suicide in a population-based sample has been reported. This study examined the association between PTSD and completed suicide in a population-based sample. Data were obtained from the nationwide Danish health and administrative registries, which include data on all 5.4 million residents of Denmark. All suicides between January 1, 1994, and December 31, 2006, were included, and controls were selected from a sample of all Danish residents. Using this nested case-control design, the authors examined 9,612 suicide cases and 199,306 controls matched to cases on gender, date of birth, and time. Thirty-eight suicide cases (0.40%) and 95 controls (0.05%) were diagnosed with PTSD. The odds ratio associating PTSD with suicide was 9.8 (95% confidence interval: 6.7, 15). The association between PTSD and completed suicide remained after controlling for psychiatric and demographic confounders (odds ratio = 5.3, 95% confidence interval: 3.4, 8.1). Additionally, persons with PTSD and depression had a greater rate of suicide than expected based on their independent effects. In conclusion, a registry-based diagnosis of PTSD based on International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, is a risk factor for completed suicide.

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