[Table/Fig-3]:
GAS phenotypic identification in comparison to spy1258 PCR.
| Assay | Sensitivity (%) |
Specificity (%) |
PPV (%) |
NPV (%) |
Kappa value * |
|---|---|---|---|---|---|
| Bacitracin sensitivity | 95.42 | 70.96 | 94.88 | 73.33 | 0.673 |
| PYR test | 95.42 | 77.41 | 95.97 | 75.0 | 0.719 |
| Latex agglutination assay | 97.71 | 80.64 | 96.61 | 86.21 | 0.805 |
p-value of all <0.001 – statistically significant.
*Kappa Agreement: <0- Less than chance agreement, 0.01–0.20 Slight agreement, 0.21– 0.40 Fair agreement, 0.41–0.60 Moderate agreement, 0.61–0.80 Substantial agreement, 0.81–0.99 Almost perfect agreement