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Table 2 Sensitivity, specificity, positive and negative likelihood ratio for NRA compared to APM (n=373)

From: The manual mycobacteria growth indicator tube and the nitrate reductase assay for the rapid detection of rifampicin resistance of M. Tuberculosisin low resource settings

APM

NRA

Sensitivity %

Specificity %

Likelihood ratio

 

No.of resistant isolates

No.of susceptible isolates

  

Positive

negative

Resistant (27)

23

4

85

 

98

0.15

Susceptible (346)

3

343

 

99