Table 3

Discordance of QTF and TST results in each group, excluding patients with indeterminate QTF results

RA-TNF1 (n = 36)

RA-TNF2 (n = 38)

TNF-naive RA

(n = 39)

TB

(n = 28)

LEPROSY

(n = 22)

Healthy controls (n = 41)

Total

(n = 204)

QTF (+)

TST (+)

5 (13%)

9 (24%)

15 (38%)

12 (40%)

12 (52%)

16 (39%)

69 (34%)

TST (-)

8 (21%)

7 (18%)

5 (13%)

3 (10%)

2 (9%)

3 (7%)

28 (14%)

QTF (-)

TST (+)

4 (11%)

5 (13%)

6 (15%)

3 (10%)

1 (4%)

12 (29%)

31 (15%)

TST (-)

19 (50%)

17 (45%)

13 (33%)

10 (33%)

7 (30%)

10 (24%)

76 (36%)

Tuberculin skin test (TST) positivity is defined as an induration of ≥ 10 mm.

Hatemi et al. Arthritis Research & Therapy 2012 14:R147   doi:10.1186/ar3882