highly significantp = 0.004
( Figure 1a ) The TB specific antigen stimulated samples demonstrated highly significant differences between active TB (median 9544 pg/ml, range: 1386–40,000 pg/ml) and LTBI (median 19350 pg/ml, range: 2200–40,000 pg/ml, p = 0.004) compared with the control group (median 536 pg/ml, range: 320–40,000 pg/ml, p = 0.0085).