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The receiver operating analysis was used to obtain cut-off, sensitivity and specificity values for the independent predictive factors. Results The age, ASA score, diabetes mellitus, IIEF score, duration of ED, peak arterial and peak end diastolic venous flow values in the 20th minute were significantly different in the two groups (p less then 0.001). Binary logistic regression analysis found age, duration of erectile dysfunction, IIEF score, peak arterial flow and venous flow rate in the 20th minute were predictive variables for the occ