From: Skin thickness affects the result of tuberculin skin test in systemic sclerosis
Cut-off indurated reaction size by TST | ≥ 5 mm | ≥ 10 mm | ≥ 15 mm | ≥ 20 mm |
---|---|---|---|---|
Sensitivity | 17.6% | 5.9% | 5.9% | 5.9% |
Specificity | 87.4% | 94.7% | 97.4% | 99.3% |
ROC area | 0.53 | 0.50 | 0.52 | 0.53 |
Positive likelihood ratio | 1.40 | 1.11 | 2.22 | 8.88 |
Negative likelihood ratio | 0.94 | 0.99 | 0.97 | 0.95 |
Positive predictive value | 13.6% | 11.1% | 20.0% | 50.0% |
Negative predictive value | 90.4% | 89.9% | 90.2% | 90.4% |