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Table 5 Simulation of positive and negative predictive values according to different TB prevalence rates

From: Smear plus Detect-TB for a sensitive diagnosis of pulmonary tuberculosis: a cost-effectiveness analysis in an incarcerated population

Simulated prevalence rates N = 294
TB N = 55 NTB N = 239
   PPV (%) NPV (%)
4.9% Smear plus culture 50 99
Smear plus Detect-TB 48 99
   PPV (%) NPV (%)
10% Smear plus culture 68 99
Smear plus Detect-TB 66 98
   PPV (%) NPV (%)
20% Smear plus culture 82 99
Smear plus Detect-TB 81 97
   PPV (%) NPV (%)
30% Smear plus culture 89 98
Smear plus Detect-TB 88 94
   PPV (%) NPV (%)
40% Smear plus culture 92 97
Smear plus Detect-TB 92 92
   PPV (%) NPV (%)
60% Smear plus culture 96 94
  Smear plus Detect-TB 96 83