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% | ||||