States with more gun laws have fewer gun-related deaths, according to a new study released Wednesday by Boston Children’s Hospital.

The leader investigator behind the research hopes the findings will drive legislators to pass gun reform across the country and increase federal funding to research on gun laws and violence. However, at least one critic argues that the study fails to take into account several important factors such as the types of laws, enforcement of laws, and gun ownership rates in states.

“Our research gives clear evidence that laws have a role in preventing firearms deaths,” said Eric Fleegler, the study’s lead investigator and a pediatric emergency doctor at Boston Children’s Hospital. “Legislators should take that into consideration.”

Fleegler and researchers from Boston Children’s Hospital, Harvard Medical School and Harvard School of Public Health studied information from all 50 states between 2007 to 2010, analyzing all firearm-related deaths reported to the Centers for Disease Control and Prevention and data on firearm laws compiled by the Brady Center to Prevent Gun Violence.

States with the most laws had a mortality rate 42% lower than those states with the fewest laws, they found. The strong law states’ firearm-related homicide rate was also 40% lower and their firearm-related suicide rate was 37% lower.

More: Study: States With More Gun Laws Have Less Gun Violence