Figure 3: ROC-curves showing the predictive function of the ED degree according to Androscan data based on the results of IIEF-15: (a) A-state variable 0 (no ED); (b) B-state variable 1 (mild ED according to Androscan data); (c) C-state variable 2 (moderate ED according to Androscan data); (d) D-state variable 3 (severe ED according to Androscan data). ROC: Receiver operating characteristic, IIEF-15: International Index of Erectile Function-15, ED: Erectile dysfunction