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Table 2 Sensitivity and specificity of the diagnostic procedure of patients with smear negative

From: Sputum smear negative pulmonary tuberculosis: sensitivity and specificity of diagnostic algorithm

TB treatment Disease status Total
  Culture +ve Culture -ve  
Yes 66 107 173
No 61 179 240
Total 127 286 413
  1. Positive predictive value = 52%
  2. Negative predictive value = 62.6%
  3. Sensitivity = 38.1%
  4. Specificity = 74.5%