TABLE 2—

Adjusted Effect of the State Regulations on Firearm Homicides: United States, 1995–2010

Outcome/Laws	IRR (95% CI)	AIC
Homicide rate		34.65
Licensing	0.74* (0.67, 0.81)
Record keeping	1.45* (1.30, 1.61)
Inspections	0.64* (0.59, 0.69)
Theft reporting	1.04 (0.95, 1.14)
Licensing and inspections	0.49* (0.42, 0.58)
Strength		34.65
1 law	1.10 (0.96, 1.26)
2 laws	0.94 (0.85, 1.05)
3 laws	0.76* (0.67, 0.86)
4 laws	0.75* (0.65, 0.86)

Note. AIC = Akaike's information criterion; CI = confidence interval; IRR = incident rate ratio. Covariates in the model included race, percent urban, percent living in poverty, percent male, percent younger than 24 years old, percent college educated, drug arrest rate, burglary rates,¹² scores, and firearm ownership proxy.

*P ≤ .001.