Table 1 summarizes demographic and clinical characteristics of the study population at baseline: median current CD4 count was 567 (418–747), current CD4/CD8 = 0.71 (IQR 0.48–1.00, data available in 2030 observations, and median duration of HIV infection was 19 (IQR 13–24) years. Here, CD4 is linked to HIV infectious disease.