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研究输精管结扎术后人群死亡和寿命是一个重要课题。＂结扎＂作为一个因素，与人群死亡、寿命关系至今还不十分明确。为研究该人群死亡、寿命，本文提出去某因素简略寿命表法，用于非结扎人群寿命表资料分析；提出截缩蒋庆琅简略寿命表法，用于分析结扎与非结扎人群寿命，并可对死亡概率作假设检验；提出对用于衡量某个死因对一定年龄范围内某一人群危害程度的指标ＰＹＬＬ，推广到考虑具有某因素的人群，该因素可否是影响＂早死＂原因；本文还提出综合分析。
It is an important topic to study the death and longevity of people after vasectomy. “Ligation” as a factor, the relationship between death and life expectancy of people is still not very clear. In order to study the death and life expectancy of this population, this paper presents a simple life-table approach to a certain factor, which is used to analyze the data of the life table of non-ligation population. It is proposed that the life-span method of truncated Jiang Qinglang be used to analyze the life span of ligation and non- The probability of death is tested by hypothesis; the PYLL, which is used to measure the degree of harm of a certain cause of death to a certain population within a certain age range, is extended to consider a certain group of people, whether this factor can affect the cause of “premature death” Comprehensive analysis.