Abstract
Background: Firearms are the most lethal method of suicide and account for approximately half of all suicide deaths
nationwide. We describe associations between firearm purchasing characteristics and firearm suicide.
Methods: Data on all legal handgun transactions in California from 1996 to 2015 were obtained from the California
Department of Justice Dealer’s Record of Sale database. Handgun purchasers were linked to mortality data to identify
those who died between 1996 and 2015. To account for variation in timing and duration of observation time, analyses
were stratified by birth cohort. The primary analysis focused on those aged 21–25 in 1996. A secondary analysis tested
associations among those aged 50–54 in 1996. Using incidence density sampling, purchasers who died by firearm
suicide (cases) were each gender-matched to 5 purchasers (controls) who remained at risk at the case’s time of death.
We examined the characteristics of purchasers and transactions, focusing on the transaction closest in time to the
case’s death. Data were analyzed with conditional logistic regression.
Results: There were 390 firearm suicides among the younger cohort and 512 firearm suicides among the older
cohort. Across both cohorts, older age at first purchase and the purchase of a revolver were associated with greater
risk of firearm suicide. For example, among the younger cohort, those who purchased a revolver versus semiautomatic
pistol had 1.78 times the risk of firearm suicide (95% CI 1.32, 2.40) in multivariable models. Other associations
varied across cohorts, suggesting cohort or age effects in purchasing patterns.
Conclusions: Findings add to the evidence on firearm suicide risk and may help inform prevention strategies and