Table 1.
Positive and negative predictive values of the test calculated for different cutoff values.
| Cutoff value | Positive | Negative | PPV (%) | NPV (%) | ||
|---|---|---|---|---|---|---|
| TP | FN | TN | FP | |||
| ≥0.4675 (fusion protein)a | 122 | 18 | 54 | 0 | 100.0 | 75.00 |
| ≥0.8890 (LPS)a | 122 | 18 | 52 | 2 | 98.39 | 74.29 |
| ≥0.4530 (fusion protein)b | 103 | 13 | 70 | 5 | 95.37 | 84.34 |
| ≥0.8105 (LPS)b | 107 | 9 | 68 | 7 | 93.86 | 88.31 |
| ≥34.12 (p-ELISA)a | 139 | 1 | 53 | 1 | 99.29 | 98.15 |
| ≥30.21 (p-ELISA)b | 114 | 2 | 73 | 2 | 98.28 | 97.33 |
a, goat sera; b, cattle sera. TP, true positives; TN, true negatives; FP, false positives; FN, false negatives; PPV, positive predictive value (TP/TP+FP) ×100; NPV, negative predictive value (TN/TN+FN) ×100.