Table 5.
Performance of different acute stress symptom requirements in predicting concurrent ratings of impairment (n = 1172).
| Minimum number of acute stress symptoms required | Sensitivity | Specificity | PPV | NPV | % correctly classified |
|---|---|---|---|---|---|
| 13 symptoms | .01 | 1.00 | 1.00 | .59 | 58.9 |
| 12 symptoms | .04 | 1.00 | .95 | .60 | 60.0 |
| 11 symptoms | .07 | 1.00 | .92 | .60 | 61.3 |
| 10 symptoms | .13 | .99 | .90 | .62 | 63.5 |
| 9 symptoms | .21 | .97 | .81 | .63 | 65.2 |
| 8 symptoms | .25 | .94 | .75 | .64 | 65.5 |
| 7 symptoms | .31 | .89 | .67 | .65 | 65.0 |
| 6 symptoms | .40 | .85 | .66 | .67 | 66.6 |
| 5 symptoms | .52 | .76 | .60 | .69 | 65.7 |
| 4 symptoms | .61 | .65 | .55 | .70 | 63.5 |
| 3 symptoms | .73 | .57 | .54 | .75 | 63.6 |
| 2 symptoms | .84 | .43 | .51 | .80 | 60.2 |
| 1 symptom | .92 | .22 | .45 | .79 | 50.8 |
Note: The workgroup developing proposed DSM-5 criteria for acute stress disorder (ASD) has suggested 8 symptoms as a diagnostic criterion (in bold). NPV = Negative predictive value; PPV = Positive predictive value.