Comparison of the Kato-Katz, Wet Mount, and Formol-Ether Concentration Diagnostic Techniques for Intestinal Helminth Infections in Ethiopia

Table 1

Wet mount, Kato-Katz, and FEC techniques results compared to the gold standard from Atse Fasil General Elementary School, Northwest Ethiopia, March 10–June 30, 2008.

Method	Result	Gold standard		Total (%)	NPV	95% CI	Sensitivity	95% CI
		Positive (%)	Negative (%)
Wet mount	Positive	136 (38.4)	0	136 (38.4)	44.0%	0.42–0.44	52.7%	0.51–0.53
	Negative	122 (34.5)	96 (27.1)	218 (61.6)
FEC	Positive	202 (57.1)	0	202 (57.1)	63.2%	0.60–0.63	78.3%	0.76–0.78
	Negative	56 (15.8)	96 (27.1)	152 (42.9)
Kato-Katz	Positive	209 (59.0)	0	209 (59.0)	66.2%	0.63–0.62	81.0%	0.79–0.81
	Negative	49 (13.8)	96 (27.1)	145 (41.0)

FEC: formol-ether concentration, NPV: negative predictive value.