Neutrophil-to-Lymphocyte Ratio in Ovarian Cancer Patients with Low CA125 Concentration

Table 4

The formula of the sensitivity, specificity, PPV, and the NPV.

		Pathology results (Gold standard)		Total
		Positive	Negative
		(Cancer group)	(Healthy group)
Analyzed marker	Positive	a (TP)	b (FP)	a+b
	Negative	c (FN)	d (TN)	c+d
Total		a+c	b+d	a+b+c+d

TP: true positive; FP: false positive; FN: false negative; TN: true negative.
Sensitivity=a/(a+c); specificity =d/(b+d); PPV=a/(a+b); NPV=d/(c+d).