Table 2

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

Legend: S = smear, C = culture, P = positive, N = negative, Se = Sensitivity, Sp = Specificity, PPV = Positive predictive value, NPV = Negative predictive value.

Demers et al.

Demers et al. BMC Infectious Diseases 2012 12:218   doi:10.1186/1471-2334-12-218

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