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. 2022 Apr 30;34(2):71–82. doi: 10.21147/j.issn.1000-9604.2022.02.02

Table S3. C-index analysis for radiomics index.

Indexes Training cohort Validation cohort
C-index (95% CI) P C-index (95% CI) P
95% CI, 95% confidence interval; *, the model was conducted by performing a least absolute shrinkage and selection operator (LASSO) Cox regression using all features directly; a, C-index was compared between T radiomics and Radiomics index (constructed by T and N radiomics features); b, C-index was compared between N radiomics and Radiomics index (constructed by T and N radiomics features); c, C-index was compared between Radiomics index (by preselected features) and Radiomics index* (by all features directly).
Radiomics index 0.648 (0.619−0.677) − 0.621 (0.578−0.665) −
T radiomics 0.608 (0.578−0.638) <0.001a 0.588 (0.542−0.635) 0.018a
N radiomics 0.629 (0.600−0.658) 0.006b 　 0.625 (0.58−0.671) 0.626b
Radiomics index* 0.644 (0.615−0.674) 0.176c 0.613 (0.57−0.656) 0.141c