|
Test groups (true negatives/non‐COVID cases) Specificity (95% CI) |
|||
| Target | Pre‐pandemic | Mixed groups | Other groups |
| IgA a | 17 (1603/1711) | 6 (5573/5949) | |
| 93.8 (90.5, 96.0) |
91.9 (68.5, 98.3) |
Suspected of COVID‐19 4 (310/385) 91.5 (84.0, 95.7) |
|
|
Current untested 2 (197/204) 96.0 (89.4, 98.6) |
|||
| IgA/IgG a | 2 (101/106) | 3 (197/256) | |
| 97.6 (66.8, 99.9) |
77.8 (68.8, 84.7) |
||
| IgA/IgM | 1 (26/56) | ||
| 46.4a (33.0, 60.3)* |
|||
|
aP value for comparison across week to week 5 obtained using ‘melogit’; both P < 0.0001 bEstimates and confidence intervals by summing the counts of true positive and false negative across 2 x 2 tables *95% exact binomial confidence interval **97.5% one‐sided exact binomial confidence interval CI: confidence interval | |||
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