Table 6 Sensitivity, specificity, PPV and NPV for typhoid fever of WHO case definition
Suspected case of Typhoid fever | Sensitivity | Specificity | PPV | NPV |
|---|---|---|---|---|
95 % CI | 95 % CI | 95 % CI | 95 % CI | |
Isolation in Blood culture of; | ||||
S. typhi | 76.81 % | 99.22 % | 97.07 % | 92.71 % |
71.99 % to 81.16 % | 98.47 % to 99.66 % | 94.31 % to 98.73 % | 91.01 % to 94.18 % | |
Probable case of Typhoid fever | ||||
TH(1:160) | 45.22 % | 82.32 % | 34.23 % | 87.83 % |
41.27 % to 49.17 % | 79.91 % to 87.82 % | 29.46 % to 38.96 % | 81.59 % to 91.31 % | |
TO(1:80) | 43.45 % | 82.31 % | 34.11 % | 87.14 % |
39.29 % to 48.97 % | 78.96 % to 84.78 % | 31.41 % to 38.85 % | 83.72 % to 92.91 % | |