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ROC curve for parameter ADC. The optimal cut-off values (AUC, sensitivity, and specificity) for distinguishing metastatic from non-metastatic lymph nodes were as follows: ADC =1.890×10−3 mm2/s (0.897, 93.3%, 80.0%), Youden index 0.733. AUC, area under the curve; ADC, apparent diffusion coefficient.
