Table 2.
Validity indices (%) of the Impact of Event Scale-Revised at different cutoff scores using the diagnosis of posttraumatic stress disorder as the criterion for “case” definition
| Cutoff point | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | OMR (%) |
|---|---|---|---|---|---|
| 18/19 | 85.7 | 83.1 | 63.8 | 94.4 | 16.2 |
| a19/20 | 85.7 | 84.1 | 65.2 | 94.4 | 15.5 |
| 20/21 | 82.9 | 86.6 | 68.2 | 93.5 | 14.4 |
| 21/22 | 78.6 | 87.6 | 68.8 | 92.1 | 14.7 |
NPV = negative predictive value; OMR = overall misclassification rate; PPV = positive predictive value.
a
optimal cutoff point.