Test and cut-off point

Patients Number (%)

Contacts Number (%)

Controls Number (%)

TST in mm

<10 mm

0 (0.0)

24 (27.3)

40 (53.3)

≥10 and <15 mm

4 (8.3)

6 (6.8)

9 (12.0)

≥15 mm

44 (91.7)

58 (65.9)

26 (34.7)

IFN-g level (IU/ml)

≥0.35 IU/ml

36 (81.8)

64 (70.3)

32 (55.2)

<0.35 IU/ml

8 (18.2)

27 (29.7)

26 (44.8)