| Results of a multisite study of U.S. residential magnetic fields. | |
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MedLine Citation:
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PMID: 11859429 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This paper describes the study design, measurement protocols, and results of a project examining residential magnetic-field exposures at eight sites across the contiguous United States. The goal of the project was to investigate surrogates that have been used in epidemiologic studies to characterize residential magnetic-field exposure. These surrogates include: personal-exposure (PE), fixed-location long-term (LT), and outside and inside point-in-time (PIT) magnetic-field measurements; net-service (or ground current) measurements; and the "wire-code category" of the residence. (The latter is a surrogate for magnetic-field exposure based on the nature and proximity of electric power lines outside the house.) Measurements were conducted on four visits to each of eight sites between January 1994 and June 1997 for a study population of 218 single-unit detached dwellings. Information on the residence, residents, and neighborhood was collected. A simple random sample of 392 single-unit detached dwellings at the sites was used to create a weighted sample of houses representative of the population of single-unit residences. The correlations among the various types of 60-Hz magnetic-field measures were relatively strong (Pearson r>0.74, Spearman rho>0.78). Variability of PE and LT measurements, as measured by the standard deviations during a visit, was independent of wire-code category. Visit means for PE, LT, and outside and inside PIT were well correlated over periods between visits of from 1.5 to 20 months (r>0.62, rho>0.76). These results support the use of survey measurements (less demanding than personal monitoring) to represent exposure that occurred up to 20 months in the past. The principal component of the total variance in PE measurements was the between-house variance; between-visit and between-site variances were generally less important. This supports the sampling of many houses with relatively few visits in residential exposure characterization studies. There was a trend for presumably higher wire-code categories to be associated with higher field summary measures for all summary measures related to magnetic-field magnitude, including PE and LT resultant, and inside and outside resultant (60 Hz) and harmonics. However, because of the overlap in field levels between categories, wire code was not a good predictor of magnetic-field levels, accounting for less than 21% of the variance in magnetic-field measurements. |
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Authors:
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Richard F Rankin; T Dan Bracken; Russell S Senior; Robert Kavet; Judith H Montgomery |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of exposure analysis and environmental epidemiology Volume: 12 ISSN: 1053-4245 ISO Abbreviation: J Expo Anal Environ Epidemiol Publication Date: 2002 Jan-Feb |
Date Detail:
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Created Date: 2002-03-07 Completed Date: 2002-06-25 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9111438 Medline TA: J Expo Anal Environ Epidemiol Country: United States |
Other Details:
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Languages: eng Pagination: 9-20 Citation Subset: IM |
Affiliation:
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Applied Research Services, Inc., Lake Oswego, Oregon, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Electric Conductivity Electric Wiring / classification Electromagnetic Fields* Environmental Monitoring / statistics & numerical data* Housing / statistics & numerical data* Reproducibility of Results Time Factors United States / epidemiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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