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对某机械厂电焊工人慢支进行了调查。结果显示 ,电焊烟尘平均浓度 3 6 6mg/m3 ,MnO2 平均浓度 1 46mg/m3 ;慢性支气管炎患病率 ,电焊工组 (2 2 9% )较对照组 (8 0 % )差异有显著性 (P <0 0 2 5 ) ;电焊工吸烟者慢性支气管炎患病率 3 0 8% ,而不吸烟者只有 9 4% ,差异有非常显著性 (P <0 0 0 5 )。
A mechanical factory slow-moving electricians were investigated. The results showed that the average concentration of welding fume was 366mg / m3 and the average concentration of MnO2 was 146mg / m3. The prevalence of chronic bronchitis was significantly higher than that of the control group (22.0%) P <0 0 2 5). The prevalence of chronic bronchitis in welders was 30.8%, but only 9.4% in nonsmokers. The difference was significant (P <0.05).