Table 4.
Cross-state associations between suicide rates (total and method-specific) and household firearm ownership and antidepressants prescription rates, 2001-2005
| All suicide | Firearm suicide | Nonfirearm suicide | |||||||
|---|---|---|---|---|---|---|---|---|---|
| IRR* | 95% CI | P-value | IRR* | 95% CI | P-value | IRR* | 95% CI | P-value | |
| Crude analyses | |||||||||
| NonTCA^:TCA ratio | 0.85 | (0.76, 0.95) | 0.0040 | 0.69 | (0.57, 0.84) | 0.0002 | 1.07 | (0.96, 1.18) | 0.2270 |
| Multivariate analyses | |||||||||
| Household firearm ownership | 1.29 | (1.18, 1.40) | <.0001 | 1.67 | (1.49, 1.88) | <.0001 | 1.04 | (0.94, 1.16) | 0.4441 |
| NonTCA^:TCA ratio | 1.02 | (0.91, 1.14) | 0.7462 | 1.05 | (0.90, 1.22) | 0.5392 | 1.02 | (0.89, 1.17) | 0.8198 |
| % Population living in urban area | 1.09 | (1.01, 1.19) | 0.0293 | 1.14 | (1.02, 1.27) | 0.0211 | 1.08 | (0.98, 1.20) | 0.1407 |
| Median income | 0.99 | (0.95, 1.02) | 0.4770 | 0.97 | (0.93, 1.02) | 0.2758 | 1.01 | (0.96, 1.07) | 0.6421 |
| Unemployment rate | 1.01 | (0.98, 1.03) | 0.6227 | 0.99 | (0.96, 1.03) | 0.6932 | 1.01 | (0.98, 1.05) | 0.5231 |
*IRR for Household Firearm Ownership and Antidepressant Prescriptions are the relative increase in suicides for one standard deviation away from the mean rate.
^Non-TCA are primarily SSRIs (SNRIs constitute the second most commonly prescribed class).
Abbreviations: IRR, Incidence Rate Ratio; CI, Confidence Intervals; TCA, Tricyclic Antidepressants.