Table 4:

Diagnostic performance of DCE-MR imaging parameters for each tumor comparison^{^a}

Parameters	Chondrosarcoma vs Chordoma		Chondrosarcoma vs Metastasis			Chordoma vs Metastasis
Parameters	nADCmean	Vp	nADCmean	Vp	K^trans (minute⁻¹)	Vp	K^trans (minute⁻¹)
Cutoff	1.99	0.03	2.09	0.06	0.12	0.09	0.30
Sensitivity	1.0 (0.68–1)	0.93 (0.66–0.99)	0.93 (0.76–0.99)	0.93 (0.78–0.99)	0.93 (0.78–0.99)	0.80 (0.61–0.92)	0.60 (0.41–0.77)
Specificity	0.86 (0.57–0.98)	0.71 (0.42–0.92)	0.87 (0.60–0.98)	0.93 (0.66–0.9)	0.71 (0.42–0.92)	0.93 (0.66–1)	1.0 (0.68–1)
PPV	0.88 (0.62–0.98)	0.77 (0.50–0.93)	0.93 (0.76–0.99)	0.97 (0.82–1)	0.88 (0.71–0.97)	0.96 (0.80–1)	1.0 (0.74–1)
NPV	1.0 (0.64–1)	0.91 (0.59–0.99)	0.87 (0.60–0.98)	0.87 (0.60–0.98)	0.83 (0.52–0.98)	0.68 (0.43–0.87)	0.54 (0.33–0.73)
Accuracy	0.93 (0.78–0.99)	0.82 (0.63–0.94)	0.91 (0.77–0.97)	0.93 (0.81–0.99)	0.86 (0.73–0.95)	0.84 (0.70–0.93)	0.73 (0.57–0.85)
AUC	0.96 (0.90–1)	0.86 (0.72–1)	0.95 (0.88–1)	0.99 (0.96–1)	0.82 (0.67–0.98)	0.92 (0.84– 1)	0.82 (0.70–0.95)

Note:—PPV indicates positive predictive value; NPV, negative predictive value.
↵a Numbers in parentheses represent 95% CIs.