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本文按配对设计的原则，严格控制年龄、身高、吸烟量、接尘量等因素，分别对５２名铸钢和铸铁接尘工人进行了肺功能的比较分析，结果表明铸钢接尘工人的ＦＶＣ、ＦＥＶ_（１．０）、ＦＥＦ_（２５～７５）、Ｖ_（７５）、Ｖ_（５０）、Ｖ_（２５）等肺功能指标均低于铸铁接尘工人，ＦＶＣ、ＦＥＶ_（１．０）有显著意义的差别（Ｐ＜０．０５）；相同接尘工龄、相同累计接尘量的配对结果，尘龄小于２０年或累计接尘量小于５００毫克·年时，两组肺功能损害未见差别（Ｐ＞０．０５），当尘龄大于２０年或累计接尘量大于５００毫克·年时，铸钢接尘工人肺功能各项指标明显低于铸铁接尘工人（Ｐ＜０．０５或Ｐ＜０．０１）。
According to the principle of pair-wise design, strictly controlling age, height, amount of cigarettes, and the amount of dust taken, the comparative analysis of lung function of 52 steel castings and cast iron dusting workers was carried out respectively. The results showed that FVC FEV 1.0, FEF 25-75, V 75, V 50 and V 25 were all lower than those of cast iron exposed workers, FVC, FEV 1.0 (P <0.05). The matching results of the same dusting age and the same accumulated dusting amount showed no significant difference in lung function damage between the two groups when the dusting age was less than 20 years or the accumulated dusting was less than 500 mg · year (P> 0.05). When the dust age was more than 20 years or the accumulated dust amount was more than 500 mg · a-1, the indexes of pulmonary function of cast-steel workers were significantly lower than those of cast iron workers Or P <0.01).