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Table 2: ROC of CBV, corrected CBV, and K₂ in differentiating PCNSLs from glioblastomas^{^a}
Parameter AUC 95% CI P Value CV SEN SPE Accuracy
CBV ratio 0.984 0.952–1.000 <.001 1.88 100 86.7 94.2
Corrected CBV ratio 0.940 0.861–1.000 <.001 3.01 90 93.3 91.4
2.08 100 46.7 77.1
K₂ 0.788 0.624–0.953 .004 1.2 75 80.0 77.1
Note:—CI indicates confidence interval; CV, cutoff value; SEN, sensitivity; SPE, specificity; AUC, area under the curve; ROC, receiver operating characteristic curve analysis.
↵a Data of sensitivity, specificity, and accuracy are in percentages.

Parameter	AUC	95% CI	P Value	CV	SEN	SPE	Accuracy
CBV ratio	0.984	0.952–1.000	<.001	1.88	100	86.7	94.2
Corrected CBV ratio	0.940	0.861–1.000	<.001	3.01	90	93.3	91.4
				2.08	100	46.7	77.1
K₂	0.788	0.624–0.953	.004	1.2	75	80.0	77.1