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Table 3 Harrell’s C-index for prognostic models of OS, RFS and LR-RFS

From: CT imaging features associated with recurrence in non-small cell lung cancer patients after stereotactic body radiotherapy

  Models Features Harrell’s C index
Point 95% CI
Lower Upper
OS Clinical features T-stage & ECOGa 0.64 0.54 0.74
Imaging features Vascular involvement, lymphadenopathy, F13a 0.76 0.67 0.84
Clinic & imaging features ECOG, vascular involvement, lymphadenopathy, PC1 0.78 0.71 0.86
RFS Clinical feature T-stage 0.61 0.54 0.68
Imaging features Vascular involvement, vascular attachment, pleural retraction, lymphadenopathy, relative enhancement 0.77 0.70 0.84
Clinic & imaging features Vascular involvement, vascular attachment, pleural retraction, lymphadenopathy, relative enhancement 0.77 0.70 0.84
LR-RFS Clinical features T-stage & ECOGa 0.62 0.54 0.70
Imaging features Vascular involvement, lymphadenopathy, F13a, F92a 0.78 0.71 0.85
Clinic & imaging features Vascular involvement, lymphadenopathy, F13a, F92a 0.78 0.71 0.85
  1. aECOG, Eastern cooperative oncology group; PC1: the 1st principle component; F13: 9b_3D_Circularity; F92: 3D Laws features L5 L5 S5 Layer 1