TABLE 3.

Agreement between results of assays for diagnosis of latent M. tuberculosis infectiona

AssayAgreement with:
TSTQFT-GITELISPOT
%bκc%κ%κ
QFT580.28860.71
QFT (BCG-unvaccinated subjects)590.30
ELISPOT650.35860.71
ELISPOT (BCG-unvaccinated subjects)690.40
LST910.78600.31590.27
LST (BCG-unvaccinated subjects)930.84
  • a For TST, n = 40; for QFT-GIT, n = 40; for ELISPOT (performed ex vivo), n = 37; for LST, n = 36. The in vitro assays were done with the peptides of ESAT-6, CFP-10, and TB7.7.

  • b Number of persons with a concordant positive or negative result divided by the total number tested.

  • c Level of agreement measured by Cohen's kappa (κ).