IFNG and tuberculosis: Similarly, this study also found that individuals with IFN-γ values >4 IU/mL had 4·4-fold higher risk of incident TB disease compared to those with IFN-γ value < 0·35 IU/mL, although this risk was not significantly higher than those with IFN-γ values between 0·35 and 4 IU/mL.