Table 2 The sensitivity and specificity of SSf-COVID19 kit with saliva compared with RT-PCR with nasopharyngeal swabs
Overall patients (n = 157) | ||||
|---|---|---|---|---|
Nasopharyngeal swab | Total | |||
Positive | Negative | |||
SSf-COVID19 kit | Positive | 32 | 0 | 32 |
Negative | 2 | 123 | 125 | |
Total | 34 | 123 | 157 | |
Sensitivity = 94.1%; Specificity = 100%; Cohen’s weighted kappa index = 0.96 | ||||
Patients with cycle threshold values ≤ 25 (n = 157) | ||||
Nasopharyngeal swab | Total | |||
Positive | Negative | |||
SSf-COVID19 kit | Positive | 28 | 4 | 32 |
Negative | 1 | 124 | 125 | |
Total | 29 | 128 | 157 | |
Sensitivity = 96.6%; Specificity = 97.0%; Cohen’s weighted kappa index = 0.90 | ||||
Symptomatic patients (n = 43) | ||||
Nasopharyngeal swab | Total | |||
Positive | Negative | |||
SSf-COVID19 kit | Positive | 27 | 0 | 27 |
Negative | 1 | 15 | 16 | |
Total | 28 | 15 | 43 | |
Sensitivity = 96.4%; Specificity = 100%; Cohen’s weighted kappa index = 0.95 | ||||