Fig. 3. A receiver operating characteristic curve was used to identify the static oxidation-reduction potential (mV/106 sperm/mL) criterion i.e., cutoff, sensitivity, and specificity, positive predictive value (PPV), negative predictive value (NPV), accuracy and area under the curve (AUC) that best predicted the normal and abnormal semen parameters as well as differentiated normal healthy controls from male factor infertility patients.