MEF2A and coronary artery disorder: To observe the association between plasma levels of MEF2A and age, the normal control group and CAD group were divided into <70 year-old subgroup (<70y-Con and <70y-CAD) and ≥70 year-old subgroup (≥70y-Con and ≥70y-CAD), respectively (70 years old was selected as the dividing line of subgroup after considering the close number of samples included in the corresponding subgroups).