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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)

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

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]