Table 5

Association between the exposure variable (age at immigration multiplied by estimated active TB incidence in country of birth) and either test results or latent class status among foreign-born, HIV-seronegative participants aged ≥5 years

Exposure quartileTST-positive (RR)QFT-IT-positive (RR)TSPOT-positive (RR)Latent class (RR)
134.3% (1.0)14.9% (1.0)13.2% (1.0)19.8% (1.0)
241.9% (1.22)22.0% (1.48)20.8% (1.58)27.0% (1.36)
353.3% (1.55)34.0% (2.28)32.5% (2.46)39.5% (1.99)
459.6% (1.74)40.2% (2.70)41.4% (3.14)46.9% (2.37)
P value for trend<2×10–16 <2×10–16 <2×10–16 <2×10–16
  • QFT-IT, QuantiFERON Gold In-Tube; RR, relative risk; TSPOT, T-SPOT.TB, classified as positive/negative by using the international standard (≥6 spots=positive; TST, tuberculin skin test; ≤5 spots=negative).