Table 3.

Comparison of the diagnostic capability of microscopy (LM) versus nested polymerase chain reaction (nPCR) (as gold standard) according to compartment (maternal blood, cord blood, and placental blood)

		nPCR			Percentages*/values†
		Positive	Negative	Total
A. Maternal blood					S	E	PPV	NPV
Microscopy	Positive	11	0	11	41	100	100	78
	Negative	16	57	73	PLR	NLR	K
	Total	27	57	84	> 41	1.6	0.4827
B. Cord blood					S	E	PPV	NPV
Microscopy	Positive	0	2	2	0	97	0	87
	Negative	11	71	83	PLR	NLR	K
	Total	11	73	84	0	1.03	−0.042
C. Placental blood					S	E	PPV	NPV
Microscopy	Positive	8	0	8	35	100	100	80
	Negative	15	61	76	PLR	NLR	K
	Total	23	61	84	> 35	1.5	0.4365

^*S = sensitivity; E = specificity; PPV = positive predictive value; NPV = negative predictive value; PLR = positive likelihood ratio; NLR = negative likelihood ratio; K = Kappa coefficient.

^†For PLR and NLR.