根据1970～1974年和1990～1992年两次农村居民死因抽样调查资料,对肥城市23年间食管癌、胃癌、肝癌、肺癌、肠癌和白血病等六种癌症的死亡变化趋势进行了分析。两次调查均按照“全国恶性肿瘤死因回顾调查方案”进行,调查和统计质量控制可靠。1970～1974年和1990～1992年,调查人 According to two sample surveys of the deaths of rural residents from 1970 to 1974 and 1990 to 1992, the death trends of six cancers, including esophageal cancer, gastric cancer, liver cancer, lung cancer, colon cancer, and leukemia, were analyzed during the 23 years in Feicheng City. Both investigations were carried out in accordance with the “National Retrospective Survey of Causes of Malignant Tumors,” and the survey and statistical quality control were reliable. From 1970 to 1974 and from 1990 to 1992, the investigators