Other studies comparing gun control laws in different U.S. states include a 2015 study which found that in the United States, "stricter state firearm legislation is associated with lower discharge rates" for nonfatal gun injuries.[44] A 2014 study that also looked at the United States found that children living in states with stricter gun laws were safer.[45] Another study looking specifically at suicide rates in the United States found that the four handgun laws examined (waiting periods, universal background checks, gun locks, and open carrying regulations) were associated with "significantly lower firearm suicide rates and the proportion of suicides resulting from firearms." The study also found that all four of these laws (except the waiting-period one) were associated with reductions in the overall suicide rate.[46]