Table 2. Sensitivity, specificity, accuracy, positive predictive value (PPV) and negative predictive value (NPV) calculated from the visual and LIT interpretation of LFAs at various criterion/cut-off.
| Positive reading criterion (ng/ml) | Sensitivity |
Specificity |
Accuracy |
PPV |
NPV |
|||||
|---|---|---|---|---|---|---|---|---|---|---|
| LIT | Visual | LIT | Visual | LIT | Visual | LIT | Visual | LIT | Visual | |
| ≥ 2 | 0.96 | 0.68 | 0.96 | 0.38 | 0.96 | 0.53 | 0.96 | 0.52 | 0.96 | 0.54 |
| ≥ 5 | 0.96 | 0.60 | 1 | 0.65 | 0.98 | 0.62 | 1 | 0.63 | 0.96 | 0.62 |
| ≥ 7.5 | 0.96 | 0.47 | 1 | 0.86 | 0.98 | 0.66 | 1 | 0.77 | 0.96 | 0.62 |
| ≥ 10 | 0.97 | 0.88 | 1 | 1 | 0.98 | 0.94 | 1 | 1 | 0.97 | 0.90 |
| ≥ 25 | 0.96 | 0.45 | 1 | 1 | 0.98 | 0.73 | 1 | 1 | 0.96 | 0.65 |