Table 2.
Cross-state associations between suicide rates (total and method-specific) and rates of household firearm ownership and antidepressants prescription , 2001-2004
| 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 |
*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.
Abbreviations: IRR, Incidence Rate Ratio; CI, Confidence Intervals.