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Table 2 Consistency between baseline and follow-up QFT-GIT stratified by TST

From: Predictors of persistently positive Mycobacterium-tuberculosis-specific interferon-gamma responses in the serial testing of health care workers

   Follow-up QFT-GIT  
  Baseline QFT-GIT Positive (n = 15)
n (%)
Negative (n = 163)
n (%)
Agreement
All subjects*
(n = 178)
Positive (n = 18) 12 (6.7) 6 (3.4) Raw = 94.9%
κ = 0.70#
  Negative (n = 160) 3 (1.7) 157 (88.2)  
Positive prior TST
(n = 54)
Positive (n = 9) 9 (16.7) 0 Raw = 100%
κ = 1.0#
  Negative (n = 45) 0 45 (83.3)  
Recent TST > 5 mm
(n = 51)
Positive (n = 10) 9 (17.6) 1 (2.0) Raw = 94.1%
κ = 0.82#
  Negative (n = 41) 2 (3.9) 39 (76.5)  
Recent TST ≥ 10 mm
(n = 44)
Positive (n = 10) 9 (20.5) 1 (2.3) Raw = 93.2%
κ = 0.81#
  Negative (n = 34) 2 (4.5) 32 (72.7)  
  1. *Four individuals with indeterminate QFT-GIT results were excluded from this analysis. #p < 0.0001, each. QFT-GIT = QuantiFERON®-TB Gold In-Tube. TST = tuberculin skin test.