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Table 4 The c-index values for performance of the multivariate model and the TNM classification for prediction of SMAD and SMFS in the training set and validation set

From: Development and external validation of nomograms to predict the risk of skeletal metastasis at the time of diagnosis and skeletal metastasis-free survival in nasopharyngeal carcinoma

Model Training set Validation set
  C-index 95% CI P-value C-index 95% CI P-value
Nomograms (SMAD) 0.83 0.78–0.87 0.005 0.76 0.71–0.79 < 0.001
TNM classification (SMAD) 0.73 0.70–0.77   0.64 0.60–0.67  
Nomograms (SMFS) 0.70 0.67–0.74 < 0.001 0.61 0.55–0.0.66 0.005
TNM classification (SMFS) 0.59 0.56–0.63   0.58 0.54–0.63  
  1. Abbreviations: SMAD skeletal metastasis at the time of diagnosis, SMFS skeletal metastasis-free survival
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