Table 3.

AUC values for all the significant variables in univariate analysis of three groups

Characteristics	Training set		External Validation set 1		External Validation set 2
	AUC	95% CI	AUC	95% CI	AUC	95% CI
Radiomics signature	0.836	0.754 ~ 0.917	0.811	0.669 ~ 0.952	0.822	0.701 ~ 0.943
MPD size	0.791	0.683 ~ 0.899	0.747	0.572 ~ 0.923	0.793	0.647 ~ 0.939
Largest cyst size	0.613	0.486 ~ .0740	0.705	0.519 ~ 0.891	0.681	0.516 ~ 0.846
Enhancing mural nodule	0.614	0.484 ~ 0.744	0.732	0.548 ~ 0.915	0.686	0.517 ~ 0.855
CA19–9 > 37kU/L	0.730	0.608 ~ 0.852	0.758	0.576 ~ 0.940	0.767	0.604 ~ 0.931

MPD Main pancreatic duct, AUC Area under the receiver operating characteristic (ROC) curve, CI Confidence internal