Objective to study dose response relationship between cumulative exposure to silica and cumulative incidence of pneumoconiosis.
目的探讨游离二氧化硅累积接触与尘肺累积发病的剂量反应关系。
Methods Correlation of cumulative exposure to silica with cumulative incidence of pneumoconiosis was analyzed based on issued literatures and recent data about their scientific research.
方法根据以往发表的文献及近年的科研成果资料，对游离二氧化硅累积接触量与尘肺累积发病率进行相关分析。
There was no obvious difference in the cumulative incidence of pneumoconiosis by exposure time between pure digging and pure mining workers with the year of mine-entrance after 1970(P>0.05).
纯掘工种与纯采工种各工龄段的 工龄别尘肺患病率之间，自1970年入矿年代以后差异无显著性（P>0.05）。
Based on exposure time by year and life table, the cumulative pneumoconiosis incidence of 30 year length of service was calculated.
以不同开始接尘年度工龄分布表为基础，用寿命表法计算30年工龄累计尘肺发病率。
Based on exposure time by year and life table, the cumulative pneumoconiosis incidence of 30 year length of service was calculated.
以不同开始接尘年度工龄分布表为基础，用寿命表法计算30年工龄累计尘肺发病率。
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