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ABSTRACT OF THE WEEK

The New England journal of medicine
Volume 382 | Issue 23 (June 2020)

Handgun Ownership and Suicide in California.

N Engl J Med. June 2020;382(23):2220 - 2229.
David M Studdert1, Yifan Zhang2, Sonja A Swanson3, Lea Prince4, Jonathan A Rodden5, Erin E Holsinger6, Matthew J Spittal7, Garen J Wintemute8, Matthew Miller9
1 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 2 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 3 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 4 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 5 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 6 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 7 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 8 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).; 9 From the Stanford Law School (D.M.S.), School of Medicine (D.M.S, Y.Z., L.P., E.E.H.), and Department of Political Science (J.A.R.), Stanford University, Stanford, and the School of Medicine, University of California at Davis, Sacramento (G.J.W.) - all in California; the Department of Epidemiology, Erasmus Medical Center, Rotterdam, the Netherlands (S.A.S.); the Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia (M.J.S.); and the Bouvé College of Health Sciences, Northeastern University, Boston (M.M.).
Copyright © 2020 Massachusetts Medical Society.

Abstract

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.).

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Comments:
Comment In N Engl J Med. 2020 Jun 4;382(23):2259-2260

Grants:
17-37241 Joyce Foundation
GA004696 US United States
internal funds School of Medicine, Stanford University

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