Development and validation of an MRI-based radiomic model for predicting overall survival in nasopharyngeal carcinoma patients with local residual tumors after intensity-modulated radiotherapy

Table 4 C-index of the models

Models	C-index (95% CI) Training cohort	P value	C-index (95% CI) Validation cohort	P value
Clinical model	0.672 (0.599–0.745)	5.422 × 10^–10a	0.634 (0.593–0.675)	0.085^a
Radiomics model	0.788 (0.724–0.852)	2.383 × 10^–4a	0.753 (0.604–0.902)	0.700^a
Combined model	0.834 (0.777–0.891)	Reference	0.734 (0.688–0.780)	Reference

ISSN: 1471-2342