Table 1.
Specificity and sensitivity of the test according to Ct values of the disease.
| Sensitivity (%) | Specificity (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Sampling Date | Positive Samples (n) | 95% CI | Negative Samples (n) | 95% CI | |||||
| March–April 2021 | Total | 141/165 | 85.5 | 79.1 | 90.5 | 458/459 | 99.8 | 98.8 | 100.0 |
| 30 December 2021 | Total | 66/139 | 47.5 | 39.0 | 56.1 | 75/80 | 93.8 | 86.0 | 97.9 |
| SGTF | 51/111 | 46.0 | 36.5 | 55.7 | |||||
| Ct ≤ 25 (SGTF) | 49/97 | 50.2 | 40.2 | 60.8 | |||||
| 5 January 2022 | Total | 77/98 | 78.6 | 69.1 | 86.2 | 53/53 | 100.0 | 93.3 | 100.0 |
| SGTF | 71/90 | 78.9 | 69.0 | 86.8 | |||||
| Ct ≤ 25 (SGTF) | 66/72 | 91.7 | 82.7 | 96.9 | |||||
Sensitivity, that is, the probability that a test result will be positive when the disease is present (true positive rate), was calculated for each group according to the following type: a/(a + b). Specificity, that is, the probability that a test result will be negative when the disease is not present (true negative rate), was calculated according to the following type: d/(c + d).