【摘要】 [目的]分析1953～1989年上海市苯的监测资料 ,确定每年苯的暴露强度等级。[方法]用SAS软件包对苯的监测资料进行统计描述 ,并进行暴露强度分级。[结果]1953～1989年上海市苯的监测资料呈偏态分布 ,样品数和算术均数波动较大 ,离散程度高。总的算术均数为132.7mg/m3;中位数为2.8mg/m3。上海市苯的暴露水平总体上呈下降趋势。[结论]通过汇总分析表明 ,用相应时间苯监测数据的中位数作为上海市苯暴露强度分级指标较为合适更多还原

【Abstract】 Objective Analyzing and grading the intensity of occupational benzene exposure during1953～1989in Shanghai.[Methods]SAS programing on the benzen exposure data fromthe Job-Exposure Matrix data-base of Shanghai.[Results]Data of51,128measurements,at26,000sites,of benzene in the workplace air were analyzed.The distribution of spectrum was greatly biased due to44%of the data were zero.It did not fit the Gaussian distribution.The arithmetic average was132.7mg/m 3 and the median was2.8mg/m 3 .There were peaks during the years of“Great Leap Forward”and“Cultural Revolution”.However,the trend of declining was obvious since1970.Gradation of the median of exposure was categorized and listed.[Conclusion]The range of occupational exposure to benzene in Shanghai during1953～1989was wide.Though the arithmetic average is rather high,zeros occupied44%of the spot samples in monitoring.Taking median value as index for the exposure intensity is an appropriate and acceptable way.更多还原