Furthermore, the CD4/CD8 ratio, calculated using percentages of CD3+ cells, was increased in the elderly healthy and CAD patient groups (5.7 ± 4.1 for EH, 4.6 ± 2.4 for CAD vs. 2.7 ± 1.0 for YH, 2.5 ± 1.0 for YS and 3.3 ± 1.8 for HS). Here, CD4 is linked to coronary artery disorder.