Table 2.

Incident rate ratios^a and 95% confidence intervals of alcohol- and/or gun-involved suicides using Poisson regression associated with 10 percentage point increase in alcohol policy score or gun policy score category, compared to no alcohol or firearm involvement

	Alcohol Involved IRR (95% CI) (n = 1817)	Firearm Involved IRR (95% CI) ((n = 2481)	Alcohol- and Firearm- Involved IRR (95% CI) (n = 1451)	Alcohol or Firearm InvolvedIRR (95% CI)(n = 5479)
APS Predictor
Model
Unadjusted Poisson Model	1.15 (1.08, 1.22)*	1.64 (1.57, 1.71)*	1.46 (1.38, 1.55)*	1.44 (1.40, 1.48)*
Adjusted Poisson Model I (state-level covariates)b	1.22 (1.03, 1.44)*	1.48 (1.31, 1.68)*	1.39 (1.18, 1.63)*	1.32 (1.22, 1.44)*
Adjusted Poisson Model II (addition of bac testing rate to model I)	1.11 (0.93, 1.32)	0.89 (0.77, 1.04)	1.00 (0.83, 1.21)	0.98 (0.89, 1.07)
Adjusted Poisson Model III (addition of gun policy score to model II)	1.01 (0.81, 1.28)	0.68 (0.55, 0.84)*	0.48 (0.35, 0.66)*	0.72 (0.63, 0.83)*
Firearm Policy Predictor
Model
Unadjusted Poisson Model	0.97 (0.96, 0.99)*	0.77 (0.75, 0.78)*	0.83 (0.81, 0.84)*	0.85 (0.85, 0.86)*
Adjusted Poisson Model I (state-level covariates)b	0.98 (0.93, 1.04)	1.08 (1.01, 1.16)*	0.89 (0.83, 0.94)*	0.98 (0.95, 1.01)
Adjusted Poisson Model II (addition of bac testing rate to model I)	0.95 (0.90, 1.01)	0.95 (0.90, 1.01)	0.86 (0.82, 0.91)*	0.93 (0.90. 0.96)*
Adjusted Poisson Model III (addition of APS score to model II)	0.96 (0.89, 1.03)	0.86 (0.79, 0.93)*	0.74 (0.67, 0.81)*	0.86 (0.82, 0.90)*

a Incident Rate ratio was based on 10 point increase in APS or Gun Law score

b Adjusted model I controls for state proportions of male, age ≥ 21, racial and ethnic composition, college degree or above, household income, unemployment, police rate per capita, degree of urbanization, and religiosity

*Incident Rate Ratios and 95% Confidence Intervals are significant at α = 0.05