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(五) 启东县主要恶性肿瘤纯率与偏率的计算作为实例,我们来计算启东县1981～1987年主要恶性肿瘤的年龄调整纯率与偏率。启东县是肝癌高发区,而肝癌发病和死亡高峰年龄较早,一批人死于肝癌,就来不及再得食管
(v) The calculation of the net malignancy and rate of major malignant tumors in Qidong County is used as an example. Let us calculate the age-adjusted net rate and deviation rate of major malignant tumors in Qidong County from 1981 to 1987. Qidong County is a high-risk area of liver cancer, and the onset and mortality of liver cancer are older. When a group of people die of liver cancer, it is too late to get esophageal again.