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观察组为符合要求的镉冶炼工49人,年龄20.8-51岁,尿镉几何均数为每克肌酐2.6(0.14-52)μg,工龄7(0.2-18)年;对照组为无
The observation group was qualified cadmium smelting workers 49 people, aged 20.8-51 years, urinary cadmium geometric mean 2.6 (0.14-52) μg per gram of creatinine, length of service 7 (0.2-18) years; the control group was