Establishment and Verification of Prognostic Nomograms for Patients with Gastrointestinal Stromal Tumors: A SEER-Based Study

Table 3

The C-indices for nomogram predictions of overall survival and cancer-specific survival.

Group	OS		CSS
	C-index	95% CI	C-index	95% CI
Training cohort	0.740	0.723 to 0.757	0.743	0.718 to 0.768
Validation cohort	0.741	0.717 to 0.765	0.746	0.713 to 0.779

Abbreviations: OS, overall survival; CSS, cancer-specific survival; C-index, index of concordance; CI, confidence interval.