Table 3.
Reported 12-month suicide attempt by ventiles of predicted risk in the test sample (n=2671)1
| Distribution2 | Sensitivity (SN) | Positive Predictive Value (PPV) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Within-Ventile | Cumulative | Within-Ventile | Cumulative | |||||||
| Risk Ventile3 | % | (SE) | SN | (SE) | SN | (SE) | PPV | (SE) | PPV | (SE) |
| 1 | 8.8 | (0.9) | 30.4 | (10.7) | 30.4 | (10.3) | 3.5 | (1.4) | 3.5 | (1.4) |
| 2 | 3.2 | (0.5) | 6.9 | (3.0) | 37.3 | (11.1) | 2.2 | (0.9) | 3.1 | (1.1) |
| 3 | 13.1 | (0.8) | 27.4 | (9.8) | 64.6 | (12.7) | 2.1 | (0.8) | 2.6 | (0.7) |
| 4 | 4.7 | (0.5) | 6.9 | (4.3) | 71.5 | (13.0) | 1.5 | (0.9) | 2.4 | (0.6) |
| 5 | 5.0 | (1.0) | 1.0 | (0.7) | 72.5 | (13.1) | 0.2 | (0.1) | 2.1 | (0.5) |
| 6–20 | 65.1 | (1.5) | 27.5 | (13.1) | 100.0 | (0.0) | 0.4 | (0.3) | 1.0 | (0.1) |
Abbreviations: SE, standard error.
1
The n=2671 respondents in the test sample represent roughly 30% of the n=8899 in the total sample, including n=35 of the n=119 total-sample respondents who reported attempting suicide in the 12 months before their STARRS-LS survey. The remaining 70% of the total sample were in the training sample.
2
As the thresholds defining ventiles of predicted risk were based on the training sample, the proportions of test sample respondents in each ventile do not equal 5%.
3
Defined in terms of thresholds in the calibrated training sample to separate the sample into 20 subsamples of equal size rank ordered in terms predicted risk.