The prevalence of anemia increased with increasing age (49.6%, 53.5% and 60.1% among patients who were 18–39, 40–59, and ≥60 years of age respectively) and with decreasing CD4 count (14.0%, 22.4%, 50.7%, and 74.6% among patients with CD4 count of ≥350, 200–349, 50–199, and <50 cells/mm3 respectively). This evidence concerns the gene CD4 and anemia (phenotype).