许多国家的调查材料表明:饮水硬度和心血管病死亡率呈负相关关系;但以前在意大利所作的有关研究,有些因为研究对象人口数太少或流动性太大,另一些由于合并有其它危险因素的存在,例如工业污染等等,致未能证实这种负相关。虽然有人认为硬度这个指标太粗,但它比较恒定,容易测定比较;作者选择了阿布鲁齐 Survey data from many countries show that there is a negative correlation between drinking water hardness and CVD death rate; however, previous studies in Italy have been conducted in some cases because of the small population or illiquidity of the study population and others due to other risks associated with the merger The existence of factors such as industrial pollution, etc., failed to confirm this negative correlation. Although some people think that the hardness of this indicator is too thick, but it is relatively constant, easy to measure comparison; the author chose Abruzzi