Cigarette-Smoking Intensity and Interferon-Gamma  Release Assay Conversion among Persons Who Inject Drugs:  A Cohort Study

<table>Adjusted risk ratios for QFT conversion (IFN-<i>γ</i> ≥ 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-<i>γ</i>:  interferon-gamma. QFT:  QuantiFERON-TB Gold In-Tube.</table>

Pulmonary Medicine

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Figure 2

Figure 2: Cigarette-Smoking Intensity and Interferon-Gamma  Release Assay Conversion among Persons Who Inject Drugs:  A Cohort Study 