Retrospective Study
Copyright ©The Author(s) 2022.
World J Gastroenterol. Apr 7, 2022; 28(13): 1347-1361
Published online Apr 7, 2022. doi: 10.3748/wjg.v28.i13.1347
Table 2 Comparison of three models in primary training, internal validation, and external validation sets

Primary training set
Internal validation set
External validation set
C-index (95%CI)
P value
C-index (95%CI)
P value
C-index (95%CI)
P value
Full model0.701 (0.655-0.746)Ref.0.684 (0.619-0.748)Ref.0.672 (0.609-0.734)Ref.
Clinical-model0.629 (0.578-0.681)0.0000.593 (0.531-0.655)0.0090.589 (0.514-0.663)0.014
TNM stage0.638 (0.576-0.699)0.0130.552 (0.462-0.641)0.0110.560 (0.462-0.657)0.033