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Variation in sensitivity and specificity of the developed ELISA system in both saliva and nasopharyngeal specimens depending on Ct value.
| Sensitivity | Specificity | PPV | NPV | Total Accuracy | |
|---|---|---|---|---|---|
| Ct ≤ 30 | |||||
| In saliva | 93.30% | 100% | 100% | 98% | 98.4 |
| In nasopharyngeal swabs | 90% | 100% | 100% | 97% | 97.6 |
| Ct > 30- ≤ 35 | |||||
| In saliva | 87.50% | 100% | 100% | 95% | 96.2 |
| In nasopharyngeal swabs | 80% | 100% | 100% | 92% | 93.9 |
| Ct > 35- ≤ 40 | |||||
| In saliva | 86% | 100% | 100% | 93% | 95.1 |
| In nasopharyngeal swabs | 88% | 100% | 100% | 94% | 95.8 |
