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Table 3 Concordance and agreement between TST, T-SPOT.TB and QFN-G-IT results according BCG vaccination status*

From: IFN-γ response on T-cell based assays in HIV-infected patients for detection of tuberculosis infection

  TST vs T-SPOT.TB TST vs QFN-G-IT T-SPOT.TB vs QFN-G-IT
  Concordance (%) κ (SE**) Concordance (%) κ (SE) Concordance (%) κ (SE)
HIV-positive       
Overall 59/73 (80.8) 0.019 (0.123) 65/73 (89) 0.373 (0.173) 65/73 (89) 0.275 (0.184)
BCG 4/8 (50) -*** 4/8 (50) -*** 8/8 (100) -***
Non-BCG 55/65 (84.6) 0.085 (0.154) 61/65 (93.8) 0.567 (0.194) 57/65 (87.7) 0.268 (0.186)
  1. * Indeterminate IFN-γ assays results were not included in the analysis.
  2. ** standard deviation
  3. ***κ value is not possible to calculate because of T-SPOT.TB and QFN-G-IT results are one constant variable.
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