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1979年3月28日,美国三英里岛核电站发生意外事故。作者对核辐射与群体癌症危险的关系进行了研究。核辐射的暴露剂量依居民住宅至核电站的距离而定。以核电站为中心,分别以0～6km、6～12km、大于12km为半径,将该岛居民划分为内、中、外3个区域。根据该岛所有医院的病历记载,获得事故前4年(1975年1月至1979年3月)和事故后7年(1979年4月至1985年12月)各区战各种癌症的发病及死亡人数,按照人口普查资料计算各区域各年度癌症标化发病率和标化死亡率。并对内区与外区、事故后与事故前作了比较,经多变量Logistic回归分析校正后,计算出遭受核辐射发生癌症危险的比数比(OR)及95％可信区间(CI)。结果发现,居住在内区的居民事故后总癌症发病危险的OR=1.4(95％CI=1.3～1.6),
March 28, 1979, the United States three miles island nuclear accident. The authors studied the relationship between nuclear radiation and group cancer risk. The exposure dose of nuclear radiation depends on the distance from residential houses to nuclear power plants. Taking the nuclear power plant as the center, the residents of the island are divided into three regions: inner, middle and outer, respectively with the radius of 0 ~ 6km, 6 ~ 12km and greater than 12km. According to the records of all hospitals in the island, the incidence and death of various types of cancer in various wars were obtained four years before the accident (January 1975 to March 1979) and seven years after the accident (April 1979 to December 1985) Population, according to the census data to calculate the annual incidence of cancer standardization and standardized mortality in each region. The internal and external regions were compared after the accident and before the accident. After multivariate Logistic regression analysis, the odds ratio (OR) and 95% confidence interval (CI) of the cancer risk of nuclear radiation were calculated. The results showed that OR = 1.4 (95% CI = 1.3-1.6) for the total risk of cancer after residents living in the inner zone,