Cutoff values, sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of the different studied MRI parameters to identify high-grade (III/IV) astrocytomas (HGA)
| Parameter | Cutoff Valuea | Sensitivity | Specificity | PPV | NPV | Accuracy |
|---|---|---|---|---|---|---|
| rCBV | ≥1.33 | 100% | 67% | 87% | 100% | 90% |
| ADC | ≤1.60 | 100% | 54% | 63% | 100% | 72% |
| Lip-Lactu/Crtu | ≥7.06 | 80% | 80% | 94% | 50% | 80% |
| Lip-Lactu/Lip-Lacn | ≥2.11 | 73% | 80% | 94% | 44% | 76% |
Note:—PPV indicates positive predictive value; NPV, negative predictive value.
↵a HGA group.