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Table 3 Diagnostic agreement of TST and QFT-IT (κ) *

From: Performance of the tuberculin skin test and interferon-γ release assay for detection of tuberculosis infection in immunocompromised patients in a BCG-vaccinated population

  QFT-IT + QFT-IT - Total κ
All participants     0.48
   TST + 26 (14.7) 11 (6.2) 37  
   TST - 23 (13.0) 117 (66.1) 140  
   Total 49 128 177  
Immunocompetent group     0.57
   TST + 17 (20.0) 8 (9.4) 25  
   TST - 7 (8.2) 53 (62.4) 60  
   Total 24 61 85  
Immunocompromised group     0.38
   TST+ 9 (9.8) 3 (3.3) 12  
   TST - 16 (17.4) 64 (69.6) 80  
   Total 25 67 92  
Immunocompromised group*     0.40
   TST+* 14 (15.2) 11 (12.0) 25  
   TST -* 11 (12.0) 56 (60.9) 67  
   Total 25 67 92  
  1. Data are presented as numbers (percentages) unless otherwise indicated.
  2. QFT-IT, QuantiFERON-TB Gold In-Tube; TST, tuberculin skin test.
  3. *Agreement between the two tests with a 5-mm induration cut off for the TST in the immunocompromised group.
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