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全国13个省市的卫生单位,进行了饮水硬度其其主要成份与心血管疾病死亡率关系的流行病学调查。调查选点有37个大、中、小城镇,涉及人口2277万人(约占全国城镇人口的四分之一)。以北京市卫生防疫站牵头对心血管疾病死亡率资料采用1974～1976年间全国肿瘤死亡回顾调查的资料,对其中心血管疾病死亡数进行了核实,并计算40岁以上人口
Health units in 13 provinces and municipalities across the country conducted an epidemiological investigation on the relationship between the main components of drinking water hardness and cardiovascular mortality. The survey site has 37 large, medium and small towns and involves a population of 22.77 million (accounting for about one quarter of the urban population in the country). Based on the data of the national retrospective investigation of cancer death from 1974 to 1976, the data of mortality of cardiovascular diseases led by the Beijing Municipal Health and Anti-Epidemic Station were used to verify the death of cardiovascular diseases and calculate the number of deaths from cardiovascular diseases over 40 years old