Sensitivity and Specificity of Different Antibody Titer Cutoffs for the Diagnosis of Previous Infection With SARS-CoV-2
| Antibody Titer | Sensitivity (%) | 95% CI | Specificity (%) | 95% CI |
|---|---|---|---|---|
| > 22.90 | 100 | 70.09%–100.0% | 11.11 | 0.5699%–43.50% |
| > 39.16 | 100 | 70.09%–100.0% | 22.22 | 3.948%–54.74% |
| > 43.22 | 100 | 70.09%–100.0% | 33.33 | 12.06%–64.58% |
| > 44.62 | 100 | 70.09%–100.0% | 44.44 | 18.88%–73.33% |
| > 46.34 | 88.89 | 56.50%–99.43% | 44.44 | 18.88%–73.33% |
| > 49.06 | 88.89 | 56.50%–99.43% | 55.56 | 26.67%–81.12% |
| > 53.95 | 88.89 | 56.50%–99.43% | 66.67 | 35.42%–87.94% |
| > 58.57 | 88.89 | 56.50%–99.43% | 77.78 | 45.26%–96.05% |
| > 61.85 | 88.89 | 56.50%–99.43% | 88.89 | 56.50%–99.43% |
| > 64.45 | 77.78 | 45.26%–96.05% | 88.89 | 56.50%–99.43% |
| > 68.21 | 77.78 | 45.26%–96.05% | 100 | 70.09%–100.0% |
| > 72.82 | 66.67 | 35.42%–87.94% | 100 | 70.09%–100.0% |
| > 77.32 | 55.56 | 26.67%–81.12% | 100 | 70.09%–100.0% |
| > 95.59 | 44.44 | 18.88%–73.33% | 100 | 70.09%–100.0% |
| > 140.6 | 33.33 | 12.06%–64.58% | 100 | 70.09%–100.0% |
| > 220.4 | 22.22 | 3.948%–54.74% | 100 | 70.09%–100.0% |
| > 319.4 | 11.11 | 0.5699%–43.50% | 100 | 70.09%–100.0% |
Abbreviations: CI, Confidence interval.