美国哥伦比亚大学的安娜·迪耶·鲁博士在密西西比州几个１０００人口居住区进行调查，发现居住条件最差地区的白人比居住条件最好地区的白人患心脏病的可能性要高出７０％；居住在最差地区的黑人则比居住在最好地区的黑人患心脏病的可能性要高出４０％。研究者在２００１年７ Dr Anna Diyelu of the University of Columbia conducted a survey in several 1,000-member residential areas in Mississippi and found that whites in the worst living conditions were 70% more likely to develop heart disease than whites with the best living conditions, Blacks living in the worst areas were 40% more likely to develop heart disease than blacks living in the best areas. Researchers in 2001 7