Fears T R
Am J Epidemiol. 1976 Nov;104(5):523-6. doi: 10.1093/oxfordjournals.aje.a112325.
Asbestos deposits are found in many parts of the United States. In this paper the question is asked: Is there an increase in risk from cancer associated with naturally-occurring asbestos? In an attempt to control for the urban effect, geographic gradient and socioeconomic class, each county in the United States with asbestos deposits was matched for percent of area that was urban and for median years in school with two nearby counties that did not have known asbestos deposits. The study of cancer mortality rates in these matched counties provides no evidence that naturally-occurring asbestos is a great hazard to the general population of counties with asbestos depostis.
在美国的许多地区都发现了石棉矿床。在本文中，提出了这样一个问题：与天然存在的石棉相关的癌症风险是否会增加？为了控制城市效应、地理梯度和社会经济阶层的影响，将美国每个有石棉矿床的县与两个附近没有已知石棉矿床的县在城市面积百分比和学校教育年限中位数方面进行匹配。对这些匹配县的癌症死亡率研究没有提供证据表明天然存在的石棉会对有石棉矿床的县的普通人群构成重大危害。
