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Table 1 Comparison of nitrate reductase assay results with conventional proportion method

From: Evaluation of nitrate reductase assay in 7H11 agar for diagnosis of multi-drug-resistant tuberculosis in eastern Nepal

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