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为了解铬酸盐生产工人罹患恶性肿瘤的情况,我们以某化工厂497名铬酸盐生产工人为接触组,某机械厂1,138名工人为对照组,对两厂进行了流行病学调查。结果报告如下:
To understand the situation of cholelithiasis workers suffering from malignant tumors, we conducted an epidemiological survey of two factories with 497 chromate producers in a chemical plant as the contact group and 1,138 workers in a machinery plant as the control group. The results are reported as follows: