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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