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Concordance between Abbott semi-quantitative anti-RBD and Abbott qualitative anti-NP, as well as EUROIMMUN (EI) anti-S1 antibody assays.
| Abbott anti-NP | EI anti-S1 | |
|---|---|---|
| (+) % Agreement | 94.6% (1021/1079) | 90.1% (972/1079) |
| (−) % Agreement | 97.0% (825/851) | 97.2% (827/851) |
| Cohen's Kappa | 91.2% (89.4%–93.0%) | 86.4% (84.1%–88.6%) |
