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Table 2 Smear and culture results per SE for the 1 st specimen and for both specimens

From: High yield of culture-based diagnosis in a TB-endemic setting

1st specimen Culture After 2 specimens Culture (combined)
   P N Total    P N Total
Smear P 345 32 377 Smear (combined) P 432 45 477
  N 337 1823 2160   N 301 1759 2060
  Total 682 1855 2537   Total 733 1804 2537
  Se = SPCP / CP 50.6%    Se = SPCP / CP 58.9%  
  Sp = SNCN / CN 98.3%    Sp = SNCN / CN 97.5%  
  PPV = SPCP / SP 91.5%    PPV = SPCP / SP 90.6%  
  NPV = SNCN / SN 84.4%    NPV = SNCN / SN 85.4%  
  1. Legend: S = smear, C = culture, P = positive, N = negative, Se = Sensitivity, Sp = Specificity, PPV = Positive predictive value, NPV = Negative predictive value.