Table 3 Estimated effect of gun laws on trends in firearm‐related death rates using negative binomial models.

Mortality	Trend before 1997 RR (95% CI)	Trend in 1997 and later RR (95% CI)	Ratio of slopes RR (95% CI), p value
Firearm homicide	0.971 (0.958 to 0.984)	0.925 (0.881 to 0.973)	0.955 (0.897 to 1.016), p = 0.15
Firearm homicide (omitting mass shootings)	0.961 (0.948 to 0.973)	0.925 (0.880 to 0.973)	0.965 (0.908 to 1.024), p = 0.2
Total non‐firearm homicide	1.011 (1.001 to 1.021)	0.976 (0.954 to 0.999)	0.965 (0.932 to 0.999), p = 0.05
Total homicide (all methods including firearm)	0.999 (0.992 to 1.006)	0.967 (0.946 to 0.988)	0.968 (0.943 to 0.993), p = 0.01
Firearm suicide	0.970 (0.964 to 0.977)	0.926 (0.892 to 0.961)	0.954 (0.922 to 0.987), p = 0.007
Total non‐firearm suicide	1.023 (1.018 to 1.029)	0.959 (0.951 to 0.968)	0.938 (0.920 to 0.956), p<0.001
Total suicide (all methods including firearm)	1.010 (1.005 to 1.015)	0.956 (0.948 to 0.964)	0.946 (0.930 to 0.963), p<0.001
Unintentional firearm deaths	0.924 (0.907 to 0.942)	1.085 (0.975 to 1.207)	1.171 (1.070 to 1.282), p = 0.001
Total firearm deaths	0.967 (0.961 to 0.973)	0.936 (0.912 to 0.961)	0.968 (0.940 to 0.997), p = 0.03