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Table 2 Resolved results for sensitivity, specificity, PPV and NPV of FT MTB (culture and clinical diagnosis)

From: Evaluation of Fluorotype MTB for detection of Mycobacterium tuberculosis complex DNA in clinical specimens from a low-incidence country

  No. of specimens with indicated results by culture and clinical data (n= 971)a     
  TB (n= 59) no TB (n= 912)     
  FT MTB pos FT MTB neg FT MTB pos FT MTB neg Sensitivity Specificity PPV NPV
Smear microscopy (%) (%) (%) (%) (95% CI) (95% CI) (95% CI) (95% CI)
Smear positive 43 0 0 3 100 100 100 100
  (82.7) (0) (0) (0.3) (89.7-100) (30.9-100) (89.7-100) (30.9-100)
Smear negative 9 7 10 899 56.3 98.9 47.3 99.2
  (17.3) (100) (100) (99.7) (30.5-79.2) (97.9-99.4) (25.2-70.5) (98.3-99.6)
All 52 7 10 902 88.1 98.9 83.8 99.2
(76.4-94.6) (97.9-99.4) (72.8-91.5) (98.3-99.6)
  1. aTB, tuberculosis; pos, positive; neg, negative; PPV, positive predictive value; NPV, negative predictive value.