Table 3. Multivariate Associations of Unit Suicide Attempts With Suicide Attempt Among Regular Army, Enlisted Soldiers Stratified by Unit Sizea.
| Unit Suicide Attempts in the Past Year | No. of Soldiers in Unit | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1-40 | 41-100 | 101-200 | 201-600 | |||||||||
| OR (95% CI) | SREb | P Value | OR (95% CI) | SREb | P Value | OR (95% CI) | SREb | P Value | OR (95% CI) | SREb | P Value | |
| 0 | 1 [Reference] | 309 | NA | 1 [Reference] | 353 | NA | 1 [Reference] | 327 | NA | 1 [Reference] | 266 | NA |
| 1 | 2.1 (1.7-2.7) | 651 | <.001 | 1.4 (1.3-1.6) | 511 | <.001 | 1.3 (1.2-1.4) | 424 | <.001 | 1.3 (1.2-1.5) | 358 | <.001 |
| 2 | 2.4 (1.7-3.4) | 747 | <.001 | 1.5 (1.3-1.8) | 546 | <.001 | 1.4 (1.3-1.5) | 456 | <.001 | 1.7 (1.4-1.9) | 439 | <.001 |
| 3 | 3.1 (2.0-4.9) | 955 | <.001 | 1.9 (1.5-2.3) | 666 | <.001 | 1.5 (1.3-1.8) | 503 | <.001 | 1.5 (1.2-1.8) | 396 | <.001 |
| 4 | 6.3 (3.6-11.0) | 1944 | <.001 | 1.6 (1.2-2.1) | 561 | .002 | 1.7 (1.5-2.1) | 568 | <.001 | 2.1 (1.6-2.6) | 545 | <.001 |
| ≥5 | 5.9 (3.9-9.1) | 1829 | <.001 | 2.2 (1.8-2.8) | 791 | <.001 | 2.0 (1.8-2.3) | 662 | <.001 | 2.4 (2.1-2.8) | 646 | <.001 |
| χ25 | 162.2 | NA | NA | 134.4 | NA | NA | 162.1 | NA | NA | 158.3 | NA | NA |
Abbreviations: NA, not applicable; OR, odds ratio; SRE, standardized risk estimate.
a
Sample described in the Methods section.
b
Number of soldiers who attempted suicide per 100 000 person-years were calculated assuming other predictors was at their sample-wide means.