https://scholars.lib.ntu.edu.tw/handle/123456789/114606
Title: | SURVEY OF RESIDENTIAL EXTREMELY-LOW- FREQUENCY MAGNETIC FIELD EXPOSURE AMONG CHILDREN IN TAIWAN | Authors: | LI, CHUNG-YI SUNG, FUNG-CHANG CHEN, PEI-CHUN LEE, PEI-CHEN CHEN, LI-MEI |
Keywords: | extremely-low-frequency;magnetic field;exposure assessment;measurement;power lines | Issue Date: | 2007 | Journal Volume: | v.33 | Journal Issue: | n.2 | Start page/Pages: | 233-238 | Source: | ENVIRONMENT INTERNATIONAL | Abstract: | This survey estimated the extremely-low-frequency magnetic field (ELF-MF) exposure in households with children under the age of 7 years in Taiwan. To select a representative sample, we used the probability proportional to size sampling technique and simple random cluster sampling technique to select study districts in each city/county of Taiwan. A total of 40 districts were selected and all households with children aged less than 7 (n-4184) were visited and solicited for in-home measurements. Four trained interviewers carried out spot-measurements in rooms of each selected household during a two-year period. A questionnaire inquiring residential characteristics and nearby power facilities was also administered to a parent or caregiver. ELF-MF measurements were performed in a total of 2214 households (53% participation rate). Controlling for participation rate, the weighted overall mean magnetic field exposure was estimated at 0.121 (standard deviation 0.185) micro-Tesla (mu T) (range 0.010-3.304 mu T). Mean exposures were higher than 0.3 and 0.4 mu T in an estimated 7.3% (n = 159) and 5.4% (n = 115) of the households, respectively. There was a substantial agreement between overall mean residential exposure and exposure measured in children's bedrooms. In a multivariate logistic regression model, we noted that buildings with advanced age, buildings for both residential and commercial uses, and buildings close to power facilities were more likely a to have mean exposure above 0.4 mu T. Our survey results indicate that residential ELF-MF exposure is likely to be higher for children in Taiwan than for children in Europe and North America. (c) 2006 Elsevier Ltd. All rights reserved. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/81809 |
Appears in Collections: | 環境與職業健康科學研究所 |
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