No of clinical signs | No of days with positive BC | No of days without positive BC | No of signs cut-off for positive test | Sensitivity (%) | Specificity (%) | Accuracy (%) |
0 | 11 | 2391 | ⩾0 | 100.0 | 0.0 | 100.0 |
1 | 19 | 803 | ⩾1 | 88.9 | 62.0 | 150.9 |
2 | 15 | 346 | ⩾2 | 69.7 | 82.9 | 152.6 |
3 | 19 | 151 | ⩾3 | 54.6 | 91.8 | 146.4 |
4 | 16 | 83 | ⩾4 | 35.4 | 95.8 | 131.1 |
5 | 3 | 38 | ⩾5 | 19.2 | 97.9 | 117.1 |
6 | 10 | 19 | ⩾6 | 16.2 | 98.9 | 115.0 |
7 | 2 | 19 | ⩾7 | 6.1 | 99.4 | 105.4 |
8 | 2 | 5 | ⩾8 | 4.0 | 99.9 | 103.9 |
9 | 2 | 0 | ⩾9 | 2.0 | 100.0 | 102.0 |
10 | 0 | 0 | ⩾10 | 0.0 | 100.0 | 100.0 |
Total | 99 | 3855 |