Number RT-PCR tests/week | True -positive antigen test | False-negative antigen test | False-positive antigen test | True-negative antigen test | Total | Sensitivity | Specificity | Positive predictive value | Negative predictive value |
1 | 15 | 27 | 19 | 10 871 | 10 932 | 35.7% (22.8% to 51.1%) | 99.83% (99.73% to 99.89%) | 44.1% (28.6% to 60.8%) | 99.75% (99.64% to 99.83%) |
2 | 2 | 12 | 5 | 3970 | 3989 | 14.3% (3.6% to 42.7%) | 99.87% (99.70% to 99.95%) | 28.6% (7.2% to 67.3%) | 99.70% (99.47% to 99.83%) |
3 | 2 | 13 | 4 | 3434 | 3453 | 13.3% (3.4% to 40.5%) | 99.88% (99.69% to 99.96%) | 33.4% (8.4% to 73.2%) | 99.62% (99.34% to 99.78%) |
4* | 0 | 4 | 0 | 1055 | 1059 | 0.0% | 100.00% | – | 99.62% (98.97% to 99.86%) |
5* | 0 | 4 | 1 | 1241 | 1246 | 0.0% | 99.92% | – | 99.62% (98.97% to 99.86%) |
6–7* | 0 | 4 | 1 | 2778 | 2783 | 0.0% | 99.96% | – | 99.62% (98.97% to 99.86%) |
Total | 19 | 64 | 30 | 23 349 | 23 462 | 22.9% (15.1% to 33.%) | 9987% (99.81% to 99.91%) | 38.8% (26.1% to 53.1%) | 99.73% (99.65% to 99.79%) |
*Model-based estimates of sensitivity and specificity and corresponding 95% CIs could not be calculated due to no observed true-positives. Raw estimates are provided.