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)
Test properties of Detailed inspection | Culture and microscopy | Molecular method | ||||
|---|---|---|---|---|---|---|
| Â | +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] | ||||