Methods: Seek interrelation between dust dose and morbidity level with the method of life table.
方法：应用寿命表法求得接尘剂量与发病水平的关系。
Results: the morbidity level increased with dust dose increased and we obtained an equation of regression between them.
结果：发病水平随接尘剂量的增高而增高，求得了两者之间的回归方程。
Results: the morbidity level increased with dust dose increased and we obtained an equation of regression between them.
结果：发病水平随接尘剂量的增高而增高，求得了两者之间的回归方程。
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