TABLE 7.
Reproducibility and intraclass correlation of commercial assays
| Commercial SARS-CoV-2 serological assay reproducibility and intraclass correlation coefficient | |||||
|---|---|---|---|---|---|
| Assay ID | Antibody | Within day (%)a | Across day (%) | Overall (%) | Intraclass correlation coefficient (ICC) |
| 1 | IgG | – | 10.4 | 10.4 | 0.997 |
| 2 | IgG | – | 9.4 | 9.4 | 0.997 |
| 3 | IgG | – | 9.0 | 9.0 | 0.997 |
| 4 | Pan Ig | 17.2 | 6.4 | 18.3 | 0.992 |
| 5 | IgG | 1.5 | 2.5 | 2.9 | 0.998 |
| 6 | IgG | 4.1 | 6.5 | 7.7 | 0.998 |
| 7 | IgG | 2.4 | 5.4 | 6.0 | 0.999 |
| 8 | Pan Ig | 1.9 | 9.4 | 9.5 | 0.998 |
| 9 | IgG | 10.3 | 8.0 | 13.0 | 0.994 |
| 10 | Pan Ig | 1.0 | 2.7 | 2.9 | 1.000 |
a
Dashes represent data that was not evaluated due to no within-day replicate testing. Data analysis was performed prior to harmonization.