Table 4:

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

Parameters	Chondrosarcoma vs Chordoma		Chondrosarcoma vs Metastasis			Chordoma vs Metastasis
	nADCmean	Vp	nADCmean	Vp	Ktrans (minute−1)	Vp	Ktrans (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.

^aNumbers in parentheses represent 95% CIs.