Table 3.
Likelihood ratios for the 4-item PTSD screen (N = 398)
| Trauma item result/screen result | PTSD (PCL-17 ≥ 50) | Likelihood ratio (95 %CI) | |
|---|---|---|---|
| Present n (%) | Absent n (%) | ||
| Trauma stem item | |||
| Trauma (positive) | 128 (87) | 214 (85) | 1.02 (0.94, 1.11) |
| No trauma (negative) | 19 (13) | 37 (15) | 0.88 (0.53, 1.47) |
| Totals | 147 (100) | 251 (100) | – |
| PTSD screen results for patients reporting trauma (n = 342) | |||
| 3 symptoms | 45 (35) | 18 (8) | 4.38 (2.53, 6.90) |
| 2 symptoms | 44 (34) | 54 (25) | 1.36 (0.98, 1.90) |
| 1 symptom | 32 (25) | 86 (40) | 0.62 (0.44, 0.87) |
| 0 (Trauma, but no symptoms) | 7 (5) | 56 (26) | 0.21 (0.10, 0.45) |
| Totals | 128 (100) | 214 (100) | – |