ROC analysis showing sensitivity, specificity, PPV, and NPV for adverse outcome of multiple cutoff levels of ADC (in 10−6/mm2/s) of the brain stem*
| Cutoff Level | Sensitivity | 95% CI† | Specificity | 95% CI† | PPV | NPV |
|---|---|---|---|---|---|---|
| <736.5 | 5.88 | 1.0–28.8 | 100.00 | 58.9–100.0 | 100.0 | 30.4 |
| <897 | 47.06 | 23.0–72.1 | 100.00 | 58.9–100.0 | 100.0 | 43.7 |
| <942.5 | 47.06 | 23.0–72.1 | 85.71 | 42.2–97.6 | 88.9 | 40.0 |
| <1151.5 | 94.12 | 71.2–99.0 | 28.57 | 4.5–0.7 | 76.2 | 66.7 |
| <1182 | 100.00 | 80.3–100.0 | 28.57 | 4.5–0.7 | 77.3 | 100.0 |
* Area under the ROC curve = 0.756. Significance level P (area = 0.5) = .0305.
† 95% CI = 0.540–0.906.