Diagnostic efficiency of abattoir meat inspection service in Ethiopia to detect carcasses infected with Mycobacterium bovis: Implications for public health

Table 3 Evaluation of diagnostic accuracies (with corresponding 95% CI) of routine abattoir inspection to detect carcasses infected with M. bovis in Ethiopia (detail abattoir inspection, culture and microscopy and molecular method considered as reference tests)

Test properties		Detailed inspection			Culture and microscopy			Molecular method
		+ve	-ve	Total	+ve	-ve	Total	+ve	-ve	Total
Routine abattoir inspection	+ve	95	22	117	58	37	95	15	43	58
	-ve	242	2963	3205	47	195	242	9	38	47
	Total	337	2985	3322	105	232	337	2 24	81	105
Sn (%) [95% CI]		28.2 [23.4-33.0]			55.2 [45.7-64.7]			62.5 [43.1-81.9]
Sp (%) [95% CI]		99.3 [99.0-99.6]			84.1 [79.3-88.8]			46.9 [36.0-57.8]
PV+ (%) [95% CI]		81.2 [74.1-88.3]			61.1 [51.2-70.9]			25.9 [14.6-37.1]
PV- (%) [95% CI]		92.4 [87.7-93.0]			80.6 [72.6-88.5]			80.9 [70.7-91.0]
LR+[95% CI]		38.3 [24.4-59.9]			3.5 [2.5-4.9]			1.2 [0.8-1.7]
LR-[95% CI]		0.72 [0.68-0.77]			0.53 [0.43-0.66]			0.8 [0.45-1.4]
Kappa [95% CI]		0.39 [0.35-0.42]			0.44 [0.2-0.45]			0.1[-0.10.2]

ISSN: 1471-2458