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根据卫生部“在全国范围内开展1／10人口死因调查”的统一部署，黑龙江省于1994年进行了1990年一1992年1／10人口死因抽样调查，现将恶性肿瘤的死因分析如下。一、材料与方法调查对象为1990年一1992年黑龙江省随机抽样地区人群中全部死亡病例。全省按分层等概率随机抽取6个样本
According to the unified deployment of the Ministry of Health’s “National Survey of Causes of Death of 1/10 Population”, Heilongjiang Province conducted a sample survey of the causes of death of 1/10 of the population in 1990-1992 in 1994. The cause of death of malignant tumors is now analyzed as follows. I. Materials and Methods The survey respondents were all deaths in 1990-1992 in Heilongjiang province randomly sampled population. The province randomly selects 6 samples according to the stratified probability