Table 4.

Discordant IGRA results

VariableNo. of discordant results (unless indicated otherwise)P value
T-SPOT.TB+ QFT-GIT (n = 18)T-SPOT.TB QFT-GIT+ (n = 11)
Age (yr) (mean ± SD)65 ± 17.355.6 ± 18.10.11
    <50 yr34
    >50 yr1570.37
Sex
    Female129
    Male620.67
Diagnosis
    RA138
    Non-RA531
DMARD use
    Yes136
    No550.43
Steroid use
    Yes95
    No961
TB exposure
    Yes20
    No16111
Chest X-ray suggestive of old TB
    Yes11
    No17100.41
BCG vaccination
    Yes119
    No720.68
Nationality
    Greek1711
    Non-Greek101
Positive TST result (≥5 mm)
    Yes101
    No8100.02
Lymphocyte count (absolute; cells/μl) (mean ± SD)2,247 ± 8162,217 ± 7280.88
Any risk factor for TB (≥1)a
    Yes157
    No340.37
  • a Risk factors for TB included age of >50 years, chest X-ray suggestive of old/healed TB, contact with a person with TB, and birth or residence in a country with a high TB prevalence (non-Greek nationality).