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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