Performance of the symptom screening tool (sensitivity analysis)*
| SARS-CoV-2 positive | SARS-CoV-2 negative | Total | |
|---|---|---|---|
| Screening positive | 71 | 1490 | 1561 |
| Screening negative | 6 | 1808 | 1814 |
| Total | 77 | 3298 | 3375 |
| Point estimates (95% CI) | |||
| Apparent prevalence | 0.46 (0.45–0.48) | ||
| True prevalence | 0.02 (0.02–0.03) | ||
| Accuracy | 0.56 (0.54–0.57) | ||
| Sensitivity | 0.92 (0.84–0.97) | ||
| Specificity | 0.55 (0.53–0.56) | ||
| Positive predictive value | 0.04 (0.04–0.06) | ||
| Negative predictive value | 0.997 (0.993–0.998) | ||
| Positive likelihood ratio | 2.04 (1.89–2.20) | ||
| Negative likelihood ratio | 0.14 (0.07–0.31) | ||
| Odds ratio | 14.36 (6.22–33.13) |
Note: CI = confidence interval, SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2.
↵* Assuming asymptomatic prevalence = 0.0035 (6 people with SARS-CoV-2 infection among 1814 without symptoms).