ROC plot analysis for ADC values differentiating an aggressive tumor from a nonaggressive tumora
| Aggressive Tumor | |
|---|---|
| AUC (95% CI) | 0.983 (0.911–1.000) (P = .002) |
| Cutoff ADC value (×10−3 × mm2/s) | 1.494 |
| Sensitivity | 1.000 (0.541–1.000) |
| Specificity | 0.900 (0.555–0.998) |
| Accuracy | 0.938 (0.698–0.998) |
| PPV | 0.857 (0.421–0.996) |
| NPV | 1.000 (0.664–1.000) |
| Positive LR | 10 (1.56–64.2) |
| Negative LR | 0 |
Note:—ROC indicates receiver operating characteristic; AUC, area under the curve; LR, likelihood ratio; NA, not available; NPV, negative predictive value; PPV, positive predictive value.
↵a Numbers in parentheses indicate 95% confidence intervals.