Fig. 7.

ROC curves in prediction of group A: the ROC curve (a) shows an AUC of 0.871, with a sensitivity of 77.8% and specificity of 86.4% in the prediction of low creatinine clearance values (group C) using a threshold medullar ADC value ≤1.98 × 10⁻³ mm²/s. AUC of 0.814 (b), with a sensitivity of 72.2% and specificity of 86.4% was found using a threshold cortical ADC value ≤1.97 × 10⁻³ mm²/s. The ROC curve (c) shows an AUC of 0.831, with a sensitivity of 77.8% and specificity of 81.8% using a threshold medullar FA value ≤0.197 × 10⁻³ mm²/s. Finally (d) an AUC value of 0.527, with a sensitivity of 27.8% and specificity of 86.4%, was reported using a threshold cortical FA value ≤0.178 × 10⁻³ mm²/s.