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烟草中含有铅、镉、硫等多种对人体有害元素。为了解吸烟对烟草中微量有害物质的吸收情况,我们对南京市不直接接触铅、镉的中学教师进行抽样调查,测定血中铅、镉的含量。现将调查结果报告如下。一、调查对象和采样方法1987年对南京市68所中学的7400多名教师用随机法(随机表)决定取样学校和教师名单。排除急、慢性疾病、妊娠后期和在校办工厂接触铅、镉者。在7所中学采集173份血样。取血时
Tobacco contains lead, cadmium, sulfur and other harmful elements of the human body. To understand the absorption of trace amounts of harmful substances in tobacco by smoking, we conducted a sample survey of secondary school teachers in Nanjing who did not have direct contact with lead and cadmium and determined the levels of lead and cadmium in the blood. The survey results are reported below. I. Surveys and Sampling Methods In 1987, more than 7,400 teachers in 68 secondary schools in Nanjing decided to sample schools and teachers by using a random method (random table). Exclude acute and chronic diseases, pregnancy and school-run factories in contact with lead, cadmium. 173 blood samples were collected at seven secondary schools. When bleeding