Table 4.
Evaluation results of the COVID-19 SIA.
| IgM | IgG | Total Ab (IgM + IgG) | ||||
|---|---|---|---|---|---|---|
| n | % (95% CI) | n | % (95% CI) | n | % (95% CI) | |
| Sensitivity | 70/76 | 92.1 (83.6–97.0) | 75/76 | 98.7 (92.9–99.9) | 76/76 | 100 (93.8–100) * |
| Specificity | 210/210 | 100 (98.3–100) * | 210/210 | 100 (97.7–100) * | 210/210 | 100 (98.3–100) * |
| PPV # | 70/70 | 100 (94.9–100) * | 75/75 | 100 (95.2–100) * | 76/76 | 100 (95.3–100) * |
| NPV # | 210/216 | 97.2 (94.1–99.0) | 210/211 | 99.5 (97.4–100) | 210/210 | 100 (98.3–100) * |
COVID-19, Coronavirus disease 2019; SIA, suspension immunoassay; Ig, immunoglobulin; Ab, antibodies; CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value; * one sided 97.5% confidence interval; # Study seropositivity = 26.6% (76/286); #, number.