Between February and April 2003, a total of 80 single-dwelling households close (< 70 m) to high-tension (161 or 345 kV) power lines in a northern community of Taiwan received measurements of indoor extremely low-frequency (ELF) magnetic field for 72 h. Measurements were performed with EMDEX II meter at a sampling rate of every 300 s, yielding some 860 readings of ELF magnetic field for each household. In addition to the 72-h mean ELF magnetic field, we also calculated arithmetic means of the first 2, 6, 12, and 288 readings taken in each household to represent the information on spot, 30-min, 60-min, and 24-h exposures, respectively. The mean 72-h exposure to ELF magnetic field for the 80 study households was estimated at 0.80 micro-Tesla (microT) with a standard deviation (SD) of 1.13 microT. The mean for pot, 30-min, 60-min, and 24-h exposure was 0.88 (SD 1.38), 0.90 (SD 1.40), 0.9 (SD 1.17), and 0.83 (SD 1.17) microT, respectively. There were high agreements, indicated by a nearly perfect intra-class correlation coefficient, between 72-h mean exposure and those short-term exposure measures. Additionally, the sensitivity and specificity of various short-term exposures in the prediction of 72-h exposure greater than 0.4 microT were similar at values of 0.82-0.87 and 0.93-0.95, respectively. This study indicates that short-term measurements of indoor ELF magnetic field seem adequate to represent the mean 72-h exposure, but tended to overpredict 72-h exposure greater than 0.4 microT. Further investigation is needed to assess whether these findings can be replicated in households far away from high-tension power lines.

译文

:在2003年2月至2003年4月之间,台湾北部一个社区中共有80个单户家庭靠近(<70 m)高压(161或345 kV)电力线,他们接受了室内极低频(ELF)的测量磁场72小时。使用EMDEX II仪表以每300 s的采样速率进行测量,每个家庭可获得约860个ELF磁场读数。除了平均72小时的ELF磁场外,我们还计算了每个家庭中头2、6、12和288个读数的算术平均值,以表示当场,30分钟,60分钟和24点的信息。 -h曝光。 80个研究家庭平均暴露在ELF磁场下72小时的时间为0.80微特斯拉(microT),标准偏差(SD)为1.13 microT。锅暴露30分钟,60分钟和24小时的平均值分别为microT的0.88(SD 1.38),0.90(SD 1.40),0.9(SD 1.17)和0.83(SD 1.17)。在72小时平均暴露量与那些短期暴露量之间,存在接近一致的类内相关系数,表明存在高度一致性。此外,预测72 h暴露大于0.4 microT时,各种短期暴露的敏感性和特异性分别为0.82-0.87和0.93-0.95。这项研究表明,室内ELF磁场的短期测量似乎足以代表72小时的平均暴露量,但往往会高估大于0.4 microT的72小时暴露量。需要进一步调查以评估这些发现是否可以在远离高压电线的家庭中复制。

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