Table 1 Comparison of nitrate reductase assay results with conventional proportion method
Drugs | Conventional PM | Nitrate reductase assay | |||||||
|---|---|---|---|---|---|---|---|---|---|
Resistant | Sensitive | Sensitivity (95% CI) | Specificity (95% CI) | PPV (%) | NPV (%) | Agreement (%) | Kappa | ||
Rifampicin | Resistant | 6 | 1 | 85.7 (42–99) | 100 (90–100) | 100 | 97.8 | 98.1 | 0.912 |
Sensitive | 0 | 45 | |||||||
Isoniazid | Resistant | 7 | 1 | 87.5 (46.6–99.3) | 100 (90–100) | 100 | 97.7 | 98.1 | 0.922 |
Sensitive | 0 | 44 | |||||||