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Association of mental disorders with firearm suicides: A systematic review with meta-analyses of observational studies in the United States

Zuriaga, A., Kaplan, M. S., Choi, N. G., Hodkinson, A., Storman, D., Brudasca, N. I., Hirani, S. P. ORCID: 0000-0002-1577-8806 and Brini, S. (2021). Association of mental disorders with firearm suicides: A systematic review with meta-analyses of observational studies in the United States. Journal of Affective Disorders, 291, pp. 384-399. doi: 10.1016/j.jad.2021.05.005

Abstract

BACKGROUND: In the United States (US), 61% of all suicide cases may involve firearms, and some evidence suggests that mental disorders may play a role in suicide by firearm. We performed the first systematic review and meta-analyses to investigate: (i) whether mental disorders are associated with suicide by firearm, and (ii) whether the risk of using a firearm compared with alternative means is associated with higher levels of suicide in individuals with a mental disorder

METHODS AND FINDINGS: We searched twelve databases from inception to the 24th of May 2020. We retrieved 22 observational studies conducted in the US. Random-effects meta-analyses showed individuals who had a diagnosis of a mental disorder had lower odds (odds ratios (OR)= 0.50, 95% CI: 0.36 to 0.69; I2=100 (95% CI: 87 to 100%), of dying by suicide with a firearm than those who did not have a diagnosis of a mental disorder. Secondary analysis showed that decedents who had a mental health diagnosis resulted in lower odds of dying by suicide by using firearms than using other means

LIMITATIONS: Risk of bias revealed a heterogeneous and poor definition of mental disorders as well as lack of control for potential demographic confounding factors. In the meta-analyses, studies were combined in the same analytic sample as 77% of these studies did not specify the type of mental disorder

CONCLUSION: While our results seem to suggest that having a mental disorder may not be consistently associated with the odds of dying by suicide using a firearm, the presence of substantial heterogeneity and high risk of bias precludes any firm conclusions.

Publication Type: Article
Additional Information: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: Mental health, Depression, Suicide, Firearms, Systematic review, Meta-analysis
Subjects: B Philosophy. Psychology. Religion > BF Psychology
H Social Sciences > HN Social history and conditions. Social problems. Social reform
R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Departments: School of Health Sciences > Healthcare Services Research & Management
Date available in CRO: 21 Jun 2021 14:09
Date deposited: 21 June 2021
Date of acceptance: 5 May 2021
Date of first online publication: 15 May 2021
URI: https://openaccess.city.ac.uk/id/eprint/26309
[img] Text - Accepted Version
This document is not freely accessible until 15 May 2022 due to copyright restrictions.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

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