TABLE 5.
Head-to-head comparison of sensitivities of IGRA, TST, and sputum smear for AFB in culture-positive pulmonary TB
| Test | No. of patients with positive result/no. with true-positive resulta | Sensitivityb (95% CIc) |
|---|---|---|
| One sputum smear for AFB | 37/112 | 33 (25-42) |
| IGRA | 84/112 | 75 (66-82) |
| TST | 102/112 | 91 (84-95) |
| Two sputum smears for AFB | 42/83 | 51 (40-61) |
| IGRA | 66/83 | 80 (70-87) |
| TST | 75/83 | 90 (82-95) |
a
A sputum culture that was positive for Mycobacterium tuberculosis was considered a true positive result.
b
Values are percentages.
c
The Wilson procedure for confidence intervals without continuity correction was used.