As presented in the Table 3, age, presence of CHD and OSA, and usage of angiotensin converting enzyme inhibitor/angiotensin receptor blocker (ACEI/ARB) were positively associated with weighted 24 h–SD of SBP; and usage of calcium channel blocker (CCB) and diuretic were negatively associated with weighted 24 h–SD of SBP. The gene discussed is ACE; the disease is obstructive sleep apnea syndrome.