European Urology

Calibration plots for Gleason sum upgrading between biopsy and pathology.(A) – Nomogram calibration plot.The calibration plot shows that the performance of the nomogram. Specifically, nomogram predicted probabilities are compared to the observed rates of biopsy Gleason sum upgrading. X-axis represents nomogram predicted probability of biopsy upgrading. Y-axis shows observed rate of upgrading. Perfect prediction would correspond to a slope of 1 (diagonal 45-degree broken line). Solid line indicates bootstrap corrected nomogram performance.(B) – Calibration plot of the D’Amico model predicting the probability of biopsy Gleason sum upgradingCalibration plot shows performance of the D’Amico model which was applied to our cohort. Specifically, model predicted probabilities are compared to the observed rates of biopsy Gleason sum upgrading. X-axis represents model predicting probability of biopsy upgrading. Y-axis shows observed rate of upgrading. Perfect prediction would correspond to a slope of 1 (diagonal 45-degree broken line). Solid line indicates logistic calibration curve and open circles represent data for prediction strata specified by D’Amico et al.