IFNG and tuberculosis: QF-TB-IT IFNγ values were significantly lower at day 90 as compared to day 0 (p = 0.042, paired Wilcoxon rank test) (figure 5), but the numbers of patients with positive QF-TB-IT values (≥0.35 IU/ml) at day 0 (25 out of 38, 66%) and at day 90 (19 out of 38, 50%) were not significantly different (p = 0.21, Liddell test).