828106.fig.002
Figure 2: Adjusted risk ratios for QFT conversion (IFN-γ ≥ 0.70 IU/mL) at 18 months based on the final multivariable Poisson regression model with robust variance which included the following covariates: quartiles of the number of cigarettes smoked daily, education, age, gender, and alcohol use. IFN-γ: interferon-gamma. QFT: QuantiFERON-TB Gold In-Tube.