Table 4. Multivariable logistic regression model for predictors of discordance between the TST and IGRA (TST+/IGRA− compared to TST−/IGRA−) adjusting for gender, ethnicity and repeated TSTs (n = 38).

Characteristic	Relative Risk (95 CI, p value)
Age (1 year increase)	1.04 (1.00–1.06, p = 0.006)
BCG at infancy vs no BCG	6.43(1.72–24.85, p = 0.005)
BCG post infancy vs no BCG	8.13(2.54–26.03, p = 0.0004)
BCG repeated* vs no BCG	20.03(3.94–101.82, p = 0.0003)

*BCG repeated refers to more than one BCG vaccine given on separate occasions.