CD4 and tuberculosis: Figure 2 shows the Kaplan-Meier 85.4% probability of survival by the end of the follow-up period (3.9 years), the KM for empirical TB treatment (Yes= 56.2% and No= 93.1%) and the KM for CD4 < 200 cells/mm3 (52.2%) and CD4 ≥ 200 cells/mm3 (93.6%).