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某瓷器厂适处于砷污染空气中,空气中含砷量达0.017,超过正常容许量4.7倍。该厂职工居住于该地区一年到七年不等,其全身症状与前一部分相似,但程度较轻,亦发现有周边视野改变。检查条件及方法一、对象: 1、患者组:根据居住年月分为两组,第一组4—7年,第二组1—3年。2、对照组:在当地居住两个月以下者,抽查了10人。二、检查方法:与前同。
A porcelain factory suitable for arsenic in the air pollution, the air containing arsenic amounted to 0.017, 4.7 times the normal allowance. The plant workers living in the region ranging from one year to seven years, its systemic symptoms similar to the previous part, but to a lesser extent, also found to have changed the surrounding vision. Inspection conditions and methods First, the object: 1, the patient group: divided into two groups according to years of residence, the first group of 4-7 years, the second group of 1-3 years. 2, the control group: living in the area for less than two months, a random sample of 10 people. Second, check the method: the same as before.