Kheifets L I, Kavet R, Sussman S S
Electric Power Research Institute, Palo Alto, California, USA.
Bioelectromagnetics. 1997;18(2):99-110. doi: 10.1002/(sici)1521-186x(1997)18:2<99::aid-bem2>3.0.co;2-#.
Childhood cancer has been modestly associated with wire codes, an exposure surrogate for power frequency magnetic fields, but less consistently with measured fields. We analyzed data on the population distribution of wire codes and their relationship with several measured magnetic field metrics. In a given geographic area, there is a marked trend for decreased prevalence from low to high wire code categories, but there are differences between areas. For average measured fields, there is a positive relationship between the mean of the distributions and wire codes but a large overlap among the categories. Better discrimination is obtained for the extremes of the measurement values when comparing the highest and the lowest wire code categories. Instability of measurements, intermittent fields, or other exposure conditions do not appear to provide a viable explanation for the difference between wire codes and magnetic with respect to the strength and consistency of their respective association with childhood cancer.
儿童癌症与电线编码（一种工频磁场的暴露替代指标）存在一定关联，但与实测磁场的关联则不太稳定。我们分析了电线编码的人群分布数据及其与几种实测磁场指标的关系。在给定的地理区域内，从低到高的电线编码类别呈现出患病率明显下降的趋势，但不同区域之间存在差异。对于平均实测磁场，分布均值与电线编码之间存在正相关关系，但各类别之间存在大量重叠。在比较最高和最低电线编码类别时，测量值的极端情况能得到更好的区分。测量的不稳定性、间歇性磁场或其他暴露条件，似乎都无法对电线编码和磁场在与儿童癌症关联的强度和一致性方面存在的差异提供合理的解释。
