Fig. 4

Subgroup analysis for diagnostic abilities of Index-1. The AUCs of Index-1 and CA19-9 in subgroups are shown horizontally. Circles represent the average AUC, and whiskers represent the lower and upper 95% confidence intervals. The red sign represents Index-1, whereas the black sign represents CA19-9. PBca, pancreatic or biliary tract cancer; HC, healthy control; AUC, area under the receiver operating characteristic curve; CI, confidence interval; CA19-9, carbohydrate antigen 19–9; ACC, Aichi Cancer Center; ASA, Asahikawa Medical University Hospital; HCC, Hyogo Cancer Center; KCC, Kanagawa Cancer Center; KYU, Kyusyu University Hospital; NCC, National Cancer Center East Hospital; ONO, JA Onomichi General Hospital; SHO, Showa University Hospital