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Table 2 Cross-state associations between suicide rates (total and method-specific) and rates of household firearm ownership and antidepressants prescription , 2001-2004

From: Explaining geographic patterns of suicide in the US: the role of firearms and antidepressants

  All suicide Firearm suicide Non-firearm suicide
  IRR* 95% CI P-value IRR* 95% CI P-value IRR* 95% CI P-value
Crude analyses          
Household firearm ownership 1.20 (1.14, 1.27) <.0001 1.51 (1.40, 1.63) <.0001 0.97 (0.91, 1.03) 0.3454
Antidepressant prescription rate 1.00 (0.93, 1.08) 0.9965 1.04 (0.90, 1.20) 0.5570 0.96 (0.90, 1.03) 0.2602
Multivariate analyses          
Household firearm ownership 1.28 (1.18, 1.38) <.0001 1.61 (1.45, 1.80) <.0001 1.05 (0.95, 1.16) 0.3703
Antidepressant prescription rate 0.96 (0.90, 1.02) 0.1858 0.93 (0.85, 1.02) 0.1437 1.00 (0.92, 1.08) 0.9855
% Population living in urban area 1.07 (0.98, 1.18) 0.1329 1.10 (0.97, 1.25) 0.1414 1.08 (0.96, 1.21) 0.1909
Median income 0.99 (0.95, 1.02) 0.4958 0.98 (0.93, 1.02) 0.2988 1.02 (0.96, 1.07) 0.5483
Unemployment rate 1.00 (0.98, 1.03) 0.9324 0.99 (0.96, 1.02) 0.5931 1.00 (0.97, 1.04) 0.8628
  1. *IRR’s for Household Firearm Ownership (Antidepressant Prescription Rate) and Antidepressant Prescriptions are the relative increase in suicides for one standard deviation increase away from the mean rate.
  2. Abbreviations: IRR, Incidence Rate Ratio; CI, Confidence Intervals.