Table 3. Associations of 10-Fold Cross-Validated Risk Strata With Subsequent Suicide Attempts Given Survey-Reported Lifetime Suicidality in 3649 Participantsa.
| Percentile | Sensitivity, % (SE)b | PPV, No. (SE)c | Alternative Contrasts Among Risk Strata, OR (95% CI) | |
|---|---|---|---|---|
| 5 Strata | 3 Strata | |||
| Top 10% | 39.2 (8.2) | 2244.4 (618.8) | 9.4 (4.5-19.4)d | |
| Top 5% | 33.5 (7.8) | 3.692.4 (1071.3) | 32.9 (10.4-103.8)d | |
| 6%-10% | 5.7 (4.4) | 633.6 (514.6) | 5.11 (0.7-37.9) | |
| 11%-30% | 28.7 (8.9) | 824.5 (306.1) | 6.8 (1.8-26.6)d | 3.4 (1.3-8.8)d |
| Bottom 70% | 32.1 (8.0) | 239.7 (67.3) | 1 [Reference] | |
| 31%-70% | 24.8 (7.6) | 338.7 (107.7) | 2.8 (0.8-10.3) | |
| 71%-100% | 7.3 (4.1) | 120.3 (70.1) | 1.0 [Reference] | |
| F4/2e | 16.0d | 18.0d | ||
Abbreviations: OR, odds ratio; PPV, positive predictive value.
Results for Regular Army soldiers in the Army Study to Assess Risk and Resilience in Servicemembers Consolidated All Army Survey who self-reported lifetime suicide ideation. Estimates are pooled across 20 multiply imputed replicate data sets, each using 10-fold cross-validation.
Sensitivity is the proportion of all suicide attempts occurring among respondents in the risk stratum represented in the row.
Positive predictive value is the number of suicide attempts occurring per 100 000 person-years among respondents in the risk stratum represented in the row.
Significant at the .05 level, 2-sided multiply imputed adjusted test.
F test to evaluate the joint significance of categorical variable levels for alternative contrasts. The 4 df F test evaluates the significance of the 5-strata classification; the 2 df F test evaluates the significance of the 3-strata classification.