本调查点为总后卫生部全国脑血管病(简称CVD)流行病学调查研究协作组的统一抽样计划确定的农村调查点,位于广东梅县地区,在人口结构、地理特征、生活水平与习惯方面均具有该地区的代表性。一、材料和方法 1.调查人群及样本:框架人群、抽样方法、抽样比及样本所依据的置信度均按全国统一计划确定,最终确定的采样人数为27,218人,男12,905 The survey point is the rural survey point determined by the unified sampling plan of the National Cooperative Group of the National Cerebrovascular Disease (CVD) Epidemiological Survey and Research Institute of the Ministry of Health in the area of ​​Meixian, Guangdong. In terms of population structure, geographical features, living standards and habits All have representation in the area. I. Materials and methods 1. Survey population and sample: The framework population, sampling method, sampling ratio and the confidence based on the sample are all determined according to the unified national plan. The final sample number is 27,218, male 12,905