Figure 1.

Calibration of the nomogram for Clavien-Dindo IV complication or mortality. Dashed line (the 45-degree line) indicated the ideal reference line where the predicted probabilities of having an event would match the observed factions. Blue triangles represented nomogram-predicted probabilities versus the actual probability grouped for each of the ten decile groups, along with the 95% confidence intervals (error bars). The distance between the pair of nomogram-predicted versus observed and the ideal line showed the absolute error of the nomogram’s prediction.