Absolute counts of B and T cells subsets in healthy Cuban subjects. A) CD4, CD8 and CD19 lymphocytes distribution by ages. The cell markers that PBL were stained for are represented on the Y axis in different colors. The linear regression results for CD19+ (green line, n=94, CD8+ (blue line, n=99) and CD4+ cells (red line, n=94) and the p values are shown on the graphs nearby each regression line, p<0.05 indicates statistical differences. B) Absolute counts of CD4, CD8 and CD19 lymphocytes subsets by gender and group of age, significant differences between young (dark gray) and aged individuals (light gray) in each case are labeled. C) Differences between males (dark gray) and females (light gray) by age groups. (*) indicate significant differences by Mann Whitney test (p<0.05).