TABLE 4

Sensitivity, specificity, and likelihood ratios (LRs) for different tuberculin skin test (TST) cut-off points correctly identifying the QuantiFERON-TB results

TST mmSensitivitySpecificityCorrectly classifiedLR+LR
≥0100%0%14.19%1
≥371.43%83.46%81.76%4.320.34
≥471.43%85.04%83.11%4.770.34
≥566.67%85.83%83.11%4.70.39
≥666.67%87.4%84.46%5.290.38
≥766.67%88.98%85.81%6.050.37
≥866.67%89.76%86.49%6.510.37
≥957.14%90.55%85.81%6.050.47
≥1052.38%91.34%85.81%6.050.52
≥1147.62%93.70%87.16%7.560.56
≥1247.62%96.85%89.86%15.120.54
≥1342.86%97.64%89.86%18.140.59
≥1438.1%99.21%90.54%48.380.62
≥1533.33%100%90.54%0.67
≥1623.81%100%89.19%0.76
≥2019.05%100%88.51%0.81
≥234.76%100%86.49%0.95
>230%100%85.81%1