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Table 3 Cross-county associations between suicide rates (total and method-specific) and rates of household firearm ownership and antidepressants prescription, 2001-2005

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
Multivariate analyses          
Household firearm ownership 1.23 (1.18, 1.28) <.0001 1.60 (1.51, 1.69) <.0001 1.00 (0.95, 1.04) 0.8409
Antidepressant prescription rate 1.01 (0.97, 1.04) 0.6745 1.02 (0.97, 1.07) 0.5214 1.00 (0.96, 1.04) 0.9767
Rural urban continuum code 0.98 (0.94, 1.02) 0.3563 0.92 (0.87, 0.97) 0.0016 1.02 (0.97, 1.07) 0.3789
Median income 0.93 (0.89, 0.96) 0.0001 0.88 (0.83, 0.93) <.0001 0.97 (0.92, 1.01) 0.1738
Unemployment rate 0.97 (0.93, 1.00) 0.0681 0.97 (0.92, 1.03) 0.3064 0.95 (0.90, 0.99) 0.0281
  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.