Nomograms to Predict Patency After Microsurgical Vasectomy Reversal

Preoperative (A) and postoperative (B) nomograms for predicting durable patency after vasectomy reversal. To use nomograms plot patient value of given parameter on appropriate scale and draw vertical line up to points line at top to assign associated point score. Repeat process for each parameter, then sum values to obtain total points score. Plot total points score on total points line and draw vertical line down to bottom line. Value represents probability of durable vasectomy reversal success. LTS, long-term success.

Nomogram calibration by bootstrapping for preoperative (A) and postoperative (B) model. Line at 45-degree angle indicates ideal nomogram reference line. Apparent line is calculated directly from data set. Bias corrected line is bootstrap corrected line which uses bootstrap sampling to validate model.