Table 4. Sensitivity, specificity, and accuracy of diagnostic tools with the Ritchie technique.

N: Negative, P: Positive, TP: True-positive, FP: False-negative, TN: True-negative, FN: False-negative, PPV: Positive predictive value, NPV: Negative predictive value

ImmunoCard STAT!: Meridian Bioscience, Germany; CerTest: Biotec, Zaragoza, Spain

Test		Ritchie		Sensitivity %	Specificity %	PPV %	NPV %	95% CI	P-value
		P	N
Immuno Card STAT! CGE	P	TP17	FP14	(100)	(83.13)	(54.84)	(100)	(0.86-0.97)	P < 0.001
	N	FN0	TN69
CerTest	P	TP17	FP2	(100)	(97.59)	(89.47)	(100)	(0.97-1.00)	P < 0.001
	N	FN0	TN81
Real-time PCR	P	TP17	FP25	(100)	(69.88)	(40.48)	(100)	(0.78-0.92)	P < 0.001
	N	FN0	TN58
Direct smears	P	TP17	FP6	(100)	(92.77)	(73.91)	(100)	(0.93-1.00)	P < 0.001
	N	FN0	TN77