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Table 3 QFT results for different TST outcomes

From: Evaluation of the tuberculin skin test and the interferon-γ release assay for TB screening in French healthcare workers

 

QFT

 

Negative

Positive

Total

  

TST (p = 0.58)

N (row%)

N (row%)

N (col%)

X-ray

Chemo

   Increase >10 mm

7 (87.5)

1 (12.5)

8 (5.4)

yes

yes

   ≥ 15 mm, no earlier TST

29 (78.4)

8 (21.6)

37 (25.0)

yes

yes

   ≤ 10-<15 mm, no earlier TST

14 (93.3)

1 (6.7)

15 (10.1)

yes

no

   ≥ 5-<10 mm, no earlier TST

16 (84.2)

3 (15.8)

19 (12.8)

no

no

   Increase ≥ 10 mm

39 (75.0)

13 (25.0)

52 (35.1)

no

no

   <5 mm, no earlier TST

15 (88.2)

2 (11.8)

17 (11.5)

no

no

  1. Chemo = preventive chemotherapy proposed
  2. TST = Tuberculin Skin Test
  3. QFT = Quantiferon TB Gold in tube
  4. Row% = Row-Percent
  5. Col% = Column-Percent