CD4 and tuberculosis: Among patients on cART, a significant lower TB-free survival proportion was found in patients originating from Sub-Saharan Africa compared with patients from Germany (93% and 99%, respectively; P < 0.001) (Figure 3c) and in patients with CD4+ cell count ≤200 cells/μl compared with patients with CD4+ cell count >200 cells/μl (98% and 99%, respectively; P < 0.001) (Figure 3d).