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From:
Published online 2011 November 1. doi: 10.1186/1756-0500-4-475

Table 2

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

TB treatmentDisease statusTotal

Culture +veCulture -ve
Yes66107173
No61179240
Total127286413

Positive predictive value = 52%

Negative predictive value = 62.6%

Sensitivity = 38.1%

Specificity = 74.5%