In a recent cohort study, investigators examined the association between state-earned income tax credit (EITC) and firearm suicide rates in the United States. Using state-level data from 46 states and Washington, DC, from 1981 through 2019, researchers applied heterogeneity-robust, two-stage difference-in-difference methods to estimate the impact of EITC policies. Each 10% increase in refundable state EITC generosity was associated with a 4.3% relative reduction in firearm suicide rates.

Source: JAMA Network Open