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Table 4 Kappa-values and QFT results for TST indicating recent LTBI and TST ≥ 10 mm

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

  QFT
  Negative Positive Total  
Recent LTBI very probable N (row%) N (row%) N (col%) Kappa
   No 84 (81.6) 19 (18.4) 103 (69.6)  
   Yes 36 (80.0) 9 (20.0) 45 (30.4) 0.02
TST ≥ 10 mm, regardless of earlier TST     
   Negative 46 (90.2) 5 (9.8) 51 (34.5)  
   Positive 74 (76.3) 23 (23.7) 97 (65.5) 0.11
  1. TST+/QFT- 74 (50% of all), TST-/QFT+ 5 (17.9% of all QFT+)