Performance of the symptom screening tool
| SARS-CoV-2 positive | SARS-CoV-2 negative | Total | |
|---|---|---|---|
| Screening positive | 71 | 1490 | 1561 |
| Screening negative | 0 | 1814 | 1814 |
| Total | 71 | 3304 | 3375 |
| Point estimates (95% CI) | |||
| Apparent prevalence | 0.46 (0.45–0.48) | ||
| True prevalence | 0.02 (0.02–0.03) | ||
| Accuracy | 0.56 (0.54–0.58) | ||
| Sensitivity | 1.00 (0.95–1.00) | ||
| Specificity | 0.55 (0.53–0.57) | ||
| Positive predictive value | 0.04 (0.04–0.06) | ||
| Negative predictive value | 1.00 (0.998–1.00) | ||
| Positive likelihood ratio* | 2.19 (2.09–2.29) | ||
| Negative likelihood ratio* | 0.02 (0.004–0.18) | ||
| Odds ratio* | 87.65 (12.16–631.50) |
Note: CI = confidence interval, SARS-CoV-2 = severe acute respiratory syndrome coronavirus 2.
↵* To estimate positive likelihood ratio, negative likelihood ratio and diagnostic odds ratio, we added 1 to each cell.