Objective: To evaluate the association between serum total cholesterol (TC) and the risk of cardiovascular diseases (CVD) in subjects aged 35-64 years.
Methods: This prospective study was performed from 1992 to 2002 in 11 provinces of China and the association between baseline TC level and the development of cardiovascular diseases was analyzed in 30 384 subjects aged 35-64 years using Cox multivariate proportional hazards regression.
Results: (1) Compared with the group of TC < 3.64 mmol/L (140 mg/dl), multivariate-adjusted relative risk of ischemic cardiovascular disease (ICVD, including CHD and ischemic stroke) increased continuously with increasing TC level. (2) TC level was positively related to the occurrence of ischemic stroke, but not to hemorrhagic stroke. The risk of CHD increased by 74% (RR = 1.743) and the risk of ischemic stroke increased by 12% (RR = 1.119) in the group with TC > or = 5.72 mmol/L compared with the group with TC < 5.72 mmol/L (220 mg/dl). (3) High serum cholesterol was responsible to 5.9% of ICVD, 11.7% of the acute CHD and 2.9% of the acute stroke. (4) At each TC level, the 10-year risk of ICVD increased in the presence of other risk factors.
Conclusion: Starting from TC of 3.64 mmol/L, the risk of ICVD increases continuously with increasing TC level. Multiple risk factor intervention should be strengthened to reduce the overall risk of CVD.