March 7

Results:  Over the 4-year study period, there were 121,084 firearm fatalities. The average state-based firearm fatality rates varied from a high of 17.9 (Louisiana) to a low of 2.9 (Hawaii) per 100,000 individuals per year. Annual firearm legislative strength scores ranged from 0 (Utah) to 24 (Massachusetts) of 28 possible points. States in the highest quartile of legislative strength (scores of >9) had a lower overall firearm fatality rate than those in the lowest quartile (scores of <2) (absolute rate difference, 6.64 deaths/100,000/y; age-adjusted incident rate ratio [IRR], 0.58; 95% CI, 0.37-0.92). Compared with the quartile of states with the fewest laws, the quartile with the most laws had a lower firearm suicide rate (absolute rate difference, 6.25 deaths/100,000/y; IRR, 0.63; 95% CI, 0.48-0.83) and a lower firearm homicide rate (absolute rate difference, 0.40 deaths/100,000/y; IRR, 0.60; 95% CI, 0.38-0.95).

Conclusions and Relevance:  A higher number of firearm laws in a state are associated with a lower rate of firearm fatalities in the state, overall and for suicides and homicides individually. As our study could not determine cause-and-effect relationships, further studies are necessary to define the nature of this association.

Full report:   http://archinte.jamanetwork.com/article.aspx?articleid=1661390

Eric W. Fleegler, MD, MPH; Lois K. Lee, MD, MPH; Michael C. Monuteaux, ScD; David Hemenway, PhD; Rebekah Mannix, MD, MPH

JAMA Intern Med. 2013;():1-9. doi:10.1001/jamainternmed.2013.1286.

Published online March 6, 2013

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