Development and External Validation of a Nomogram for Predicting Overall Survival in Stomach Cancer: A Population-Based Study

Table 4

Discrimination of the nomogram.

Variables (95% CI)	Training Group	Testing Group
C-index	0.790 (0.777, 0.803)	0.789 (0.776, 0.802)
Accuracy	0.722 (0.709, 0.736)	0.720 (0.707, 0.733)
Specificity	0.717 (0.699, 0.735)	0.713 (0.695, 0.731)
Sensitivity	0.729 (0.709, 0.748)	0.729 (0.710, 0.748)
PPV	0.676 (0.657, 0.737)	0.673 (0.653, 0.733)
NPV	0.765 (0.748, 0.783)	0.764 (0.747, 0.782)

CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value.