Table 5.

Sensitivity, specificity, PPV, and NPV of malignant tumor diagnosis by using threshold of tHb before ($\mathrm{th}=80\mu \mathrm{M}$) and after ($\mathrm{th}=64\mu \mathrm{M}$) subtracting background value.

Subtraction bg.	Parameter	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
With	Tis-T1	87.5	92.6	66.0	97.8
	Tis-T1 and T2-T4	74.6	92.6	71.0	93.8
Without	Tis-T1	85.0	90.2	58.6	97.4
	Tis-T1 and T2-T4	72.9	90.2	64.2	93.2