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Table 4 Evaluation of diagnostic accuracies (with corresponding 95% CI) of detailed abattoir inspection procedure to detect carcasses infected with M. bovis (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 of Detailed inspection Culture and microscopy Molecular method
  +ve -ve Total +ve -ve Total
+ve 105 232 337 24 81 105
-ve 4 10 14 - 14 14
Total 109 242 351 24 85 119
Sn (%) [95% CI] 96.3 [92.8-99.9] 100.0 [100.0-100.0]
Sp (%) [95% CI] 4.1 [1.6-6.6] 14.7 [7.6-21.9]
PV+(%) [95% CI] 31.2 [26.2-36.1] 22.9 [14.8-30.9]
PV-(%) [95% CI] 71.4 [66.6-76.3] 100.0 [100.0-100.0]
LR+ 1.0 [0.9-1.1] 1.2 [1.1-1.3]
LR- 0.9 [0.3-2.8] 0.0 [0.0-0.0]
Kappa [95% CI] 0.003 [-0.01-0.03] 0.1 [0.001-0.13]