Head to head comparison of TST & QFT positivity in different categories of tuberculosis patients (vs control)
| Parameter | Value obtained for TST (95% CI) | Value obtained for QFT (95% CI) |
| Pulmonary tuberculosis | ||
| Sensitivity for positive test | 83.33% (0.5858 to 0.9642) | 61.11% (0.3575 to 0.8270) |
| Specificity for positive test | 60% (0.4060 to 0.7734) | 50% (0.3130 to 0.6870) |
| Efficiency (correct classification rate) | 68.75% (0.5375 to 0.8134) | 54.17% (0.3917 to 0.6863) |
| Predictive value of positive test | 55.56% (0.3533 to 0.7452) | 42.31% (0.2335 to 0.6308) |
| OR | 7.5000 (1.7791 to 31.6170) | 1.5714 (0.4793 to 5.1526) |
| Predictive value of negative test | 85.71% (0.6366 to 0.9695) | 68.18% (0.4513 to 0.8614) |
| Extra pulmonary tuberculosis | ||
| Sensitivity for positive test | 66.67% (0.3489 to 0.9008) | 58.33% (0.2767 to 0.8483) |
| Specificity for positive test | 60% (0.4060 to 0.7734) | 50%(0.3130 to 0.6870) |
| Predictive value of a positive test | 40% (0.1912 to 0.6395) | 31.82% (0.1386 to 0.5487) |
| Efficiency (correct classification rate) | 61.90% (0.4564 to 0.7643) | 52.38% (0.3642 to 0.6800) |
| OR | 3.0000 (0.7361 to 12.2268) | 1.4000 (0.3620 to 5.4139) |
| Predictive value of negative test | 81.82% (0.5972 to 0.9481) | 75% (0.5090 to 0.9134) |
| Any tuberculosis | ||
| Sensitivity for positive test | 76.67% (0.5772 to 0.9007) | 60% (0.4060 to 0.7734) |