Fig. 5
From: Preoperative prediction of peripancreatic vein invasion by pancreatic head cancer
a Receiver operating characteristics curve for vein invasion in training cohort (using the nomogram values). The C-index is 0.896; b Calibration curves for comparison between predicted probability of vein invasion and observed vein invasion in training cohort (using the nomogram values); c Receiver operating characteristics curve for vein invasion in external validation cohort (using the nomogram values). The C-index is 0.963; d Calibration curves for comparison between predicted probability of vein invasion and observed vein invasion in training cohort (using the nomogram values)