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ROC curve for the IIEF score. The optimal cutoff point for IIEF was 26. Area under the ROC curve (AUC) was 0.750 with 95% CI (0.648–0.808) and P < 0.001. The sensitivity and specificity of IIEF as a screening test was 55% and 87%, respectively. Note: area under the curve indicates the predictive power. Predictive power will be high if it is far from 0.5 value (close to 1 value).
