Incidence of end point events
The endpoint events concerned in this study are MACEs, the most important of which are coronary heart disease, stroke and related death. In previous studies, the standardized annual incidence of coronary heart disease in people over 45 years old in Beijing was estimated to be 497 / 100,00017, and the standardized annual incidence of stroke in people over 40 years old in China was estimated to be 533 / 100,00018. Regardless of the difference in age composition of the population, during the 3-year follow-up period of this study, the incidence of CV events was estimated to be about 30/1,000 people, and a total of about 45 cases of CV events could be obtained.