Power-Frequency Magnetic Fields and Childhood Brain Tumors : A Case-Control Study in Japan
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概要
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Background: The strength of the association between brain tumors in children and residential power-frequency magnetic fields (MF) has varied in previous studies, which may be due in part to possible misclassification of MF exposure. This study aimed to examine this association in Japan by improving measurement techniques, and by extending measurement to a whole week.Methods: This population-based case-control study encompassed 54% of Japanese children under 15 years of age. After excluding ineligible targeted children, 55 newly diagnosed brain tumor cases and 99 sex-, age-, and residential area-matched controls were included in the analyses. The MF exposures of each set of matching cases and controls were measured in close temporal proximity to control for seasonal variation; the average difference was 12.4 days. The mean interval between diagnosis and MF measurements was 1.1 years. The weekly mean MF level was defined as the exposure. The association was evaluated using conditional logistic regression analysis that controlled for possible confounding factors.Results: The odds ratios (95% CI) for exposure categories of 0.1 to 0.2, 0.2 to 0.4, and above 0.4 µT, against a reference category of <0.1 µT, were 0.74 (0.17–3.18), 1.58 (0.25–9.83), and 10.9 (1.05–113), respectively, after adjusting for maternal education. This dose-response pattern was stable when other variables were included in the model as possible confounding factors.Conclusions: A positive association was found between high-level exposure—above 0.4 µT—and the risk of brain tumors. This association could not be explained solely by confounding factors or selection bias.
- 2010-01-01
著者
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SAITO Tomohiro
National Research Institute for Child Health and Development
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NITTA Hiroshi
Shakaihoken Funabashichuo Hospital
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KUBO Osami
National Institute for Environmental Studies
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YAMAMOTO Seiichiro
Tokyo Women's Medical University
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YAMAGUCHI Naohito
National Cancer Center, Center for Cancer Control and Information Services
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AKIBA Suminori
Kagoshima University
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HONDA Yasushi
University of Tsukuba
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HAGIHARA Jun
Miyagi University
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ISAKA Katsuo
Tokushima University
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OJIMA Toshiyuki
Hamamatsu University School of Medicine
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NAKAMURA Yosikazu
Jichi Medical School
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MIZOUE Tetsuya
International Medical Center of Japan
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ITO Satoko
Hiroshima University
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EBOSHIDA Akira
Hiroshima University
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YAMAZAKI Shin
Kyoto University
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SOKEJIMA Shigeru
National Institute of Public Health
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KUROKAWA Yoshika
National Institute for Environmental Studies
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KABUTO Michinori
National Institute for Environmental Studies
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Mizoue Tetsuya
九州大学 医学部予防医学
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Kabuto Michinori
国立環境研究所
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Nitta Hiroshi
National Inst. For Environmental Studies
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Nitta H
Shakaihoken Funabashichuo Hospital
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Ojima Toshiyuki
Hamamatsu Univ. School Of Medicine
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Yamamoto Seiichiro
Tokyo Women's Medical University
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Akiba Suminori
Kagoshima Univ.
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Mizoue T
Department Of Preventive Medicine Graduate School Of Medicine Kyushu University
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Saito Tomohiro
National Res. Inst. For Child Health And Dev.
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Yamazaki Shin
Kyoto Univ.
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Yamaguchi Naohito
National Cancer Center Center For Cancer Control And Information Services
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Sokejima S
National Institute Of Public Health
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Sokejima Shigeru
Department Of Community Medicine Toyama Medical And Pharmaceutical University
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Mizoue Tetsuya
Department Of Epidemiology And International Health Research Institute National Center For Global He
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Mizoue Tetsuya
Department Of Epidemiology And Prevention International Clinical Research Center National Center For Global Health And Medicine
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