Table 8 The concordance between all three immunological Assays.

From: Comparison of interferon gamma release assays and tuberculin skin test performance for diagnosing Mycobacterium tuberculosis infection in the Pakistani population

Study Groups

Concordance

k (95% CI)

QFT-plus vs. X-DOT-TB

X-DOT-TB vs. TST

QFT-plus vs. TST

ATB patients

0.17 (−0.07-0.4)

0.16 (−0.08-0.32)

0.05 (−0.19-0.3)

NTBOPD Patients

0.57 (0.19–0.81)

−0.20 (−0.28-0.25)

0.318 (−0.8-0.6)

Healthy individuals

0.51 (0.29–0.68)

0.52 (0.38–0.64)

0.389 (0.14–0.59)

Total Subjects

0.46 (0.32–0.59)

0.31 (0.20–0.41)

0.23 (0.06–0.3)

  1. TST: Tuberculin skin test; ATB: Active TB; NTBOPD: Non-TB other pulmonary diseases; OR: Odds Ratio, κ: kappa coefficient.
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