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Table 2 The C-index of the prognostic model, TNM staging, Treatment, and EBV DNA for prediction of OS in the training cohort and validation cohort

From: Development and validation of a risk prediction score for patients with nasopharyngeal carcinoma

Factors C-index (95% CI) P
For training cohort
 Our model 0.733 (0.673 ~ 0.793)  
 TNM staging 0.712 (0.657 ~ 0.768)  
 Treatment 0.542 (0.505 ~ 0.580)  
 EBV DNA 0.691 (0.626 ~ 0.756)  
 Prognostic model vs TNM staging   0.531
 Prognostic model vs Treatment   < 0.001
 Prognostic model vs EBV DNA   0.035
For validation cohort
 Our model 0.772 (0.691 ~ 0.853)  
 TNM staging 0.699 (0.628 ~ 0.770)  
 Treatment 0.551 (0.503 ~ 0.600)  
 EBV DNA 0.739 (0.652 ~ 0.826)  
 Prognostic model vs TNM staging   0.099
 Prognostic model vs Treatment   < 0.001
 Prognostic model vs EBV DNA   0.259
  1. C-index: concordance index; CI: confidence interval; P values are calculated based on normal approximation using function rcorrp.cens in Hmisc package