The three TB groups: 1) newly-diagnosed with TB by sputum culture, 2) already taking TB treatment for known/presumed active disease prior to enrollment, and 3) TB free, meaning a negative enrollment sputum culture and not on TB treatment, are further stratified based on CD4 count ≥100/μl and CD4 <100/μl. Analysis is adjusted for smoking status, age, opportunistic infection history, and gender. Vertical lines represent 95% CI around hazard ratios.