Table 3.

Accuracy and reliability of the MGIT compared with the BACTEC 460TB system for the four drugs tested

DrugaSpecificity (%)Sensitivity (%)NPVb (%)PPVc(%)Accuracy
INH10097.699.1100.00.99
RMP10095.899.9100.00.99
EMB
 Expt 199.086.597.793.80.97
 Expt 299.292.998.596.30.98
SM99.498.299.498.20.99
  • a Drugs were used at the concentrations given in Table 2, footnote a.

  • b NPV, negative predictive value.

  • c PPV, positive predictive value.