No. of specimens with indicated results by culture and clinical data (n= 971)a | ||||||||
---|---|---|---|---|---|---|---|---|
TB (n= 59) | no TB (n= 912) | |||||||
FT MTB pos | FT MTB neg | FT MTB pos | FT MTB neg | Sensitivity | Specificity | PPV | NPV | |
Smear microscopy | (%) | (%) | (%) | (%) | (95% CI) | (95% CI) | (95% CI) | (95% CI) |
Smear positive | 43 | 0 | 0 | 3 | 100 | 100 | 100 | 100 |
(82.7) | (0) | (0) | (0.3) | (89.7-100) | (30.9-100) | (89.7-100) | (30.9-100) | |
Smear negative | 9 | 7 | 10 | 899 | 56.3 | 98.9 | 47.3 | 99.2 |
(17.3) | (100) | (100) | (99.7) | (30.5-79.2) | (97.9-99.4) | (25.2-70.5) | (98.3-99.6) | |
All | 52 | 7 | 10 | 902 | 88.1 | 98.9 | 83.8 | 99.2 |
(76.4-94.6) | (97.9-99.4) | (72.8-91.5) | (98.3-99.6) |