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Table 7: Comparison of predictive performance of different Cox survival models built with prognostic factors obtained pre- and postoperatively
Prognostic Models Harrell C 95% CI Somers D 95% CI
Preoperative (age, rCBV median ≥ 5.195, ADC median < 0.799 × 10⁻³ mm²/s) 0.77 0.71–0.83 0.61 0.45–0.77
Postoperative (age, rCBV median ≥ 5.195, ADC median < 0.799 × 10⁻³ mm²/s, histologic grade) 0.78 0.72–0.84 0.64 0.48–0.81
Histologic grade 0.67 0.61–0.73 0.35 0.22–0.48

Prognostic Models	Harrell C	95% CI	Somers D	95% CI
Preoperative (age, rCBV median ≥ 5.195, ADC median < 0.799 × 10⁻³ mm²/s)	0.77	0.71–0.83	0.61	0.45–0.77
Postoperative (age, rCBV median ≥ 5.195, ADC median < 0.799 × 10⁻³ mm²/s, histologic grade)	0.78	0.72–0.84	0.64	0.48–0.81
Histologic grade	0.67	0.61–0.73	0.35	0.22–0.48