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American Journal of Epidemiology Vol. 136, No. 9: 1041-1051
Copyright © 1992 by The Johns Hopkins University School of Hygiene and Public Health

research-article

Magnetic Fields of Video Displau Terminals and Spontaneous Abortion

Marja-Liisa Lindbohm1, Maila Hietanen1, Pentti Kyyronen1, Markku Sallmen1, atrick von Nandelstadh1, Helena Taslomem2, Matti Pekkarinen3, Matti Ylikoski4 and Kari Hemminiki1,5

1Department of Industrial Hygiene and Toxicology, Institute of Occupational Health Helsinkl, Finland
2Department of Occupatinal Medivine, Institute of Occupational Health Helsinki, Finland
3social Insurance Institution Helsinki, Finaland
4Postipsnkki Ltd Helsinki, Finland

5Curent address: Center for Nutrition and Toxicology, Karolinska Institute, Huddinge, Sweden

The aim of this study was to exam, ine whether work witha video display terminal and exposure o the magnetic fields of video display terminals are related to spontaneous abortion. The stidy was conducted among women employed ad bank clerks and clerical workets in three companies in Finland. The cases (191 spontaneous abortions) and controls (394) births) were identified from Finnish medical registers for the years 1975–1985. Use of video display terminals was defined using the worketrs own reports and information provided bythe companies. The assesment opf exposure to the magnetic fields was based on measurements of the fields of video display terminals. The odds ratio for spontaneous abortion for working with video display terminals wa not increased (odds ratio = 1. 1, 95% confidence intercval 0. 7 – 1. 6). However, the odds ratio for workers who had sed a video display term, inal with a h9gh level of extremely low frequency magnetic fields (>0. 9 ßT) was 3. 4 (95% confidence interval 1. 4–8.6) compared with workers using a terminal with alow level of these magnetic fields (<0. 4ßT). Adjustment for ergonomic factors and mental work load factors changed the odds ratio for magnetic field exposure only vry slightly. Tghe findingfs suggest the need for future studies with assessment of exposure to the magnetic fields in the actual working environment to confirm the possibnle risjk. Am J Epiodemiol 1992. 136: 1041–51

abortion; computer terminals; electromagnetic fields; pregnancy outcome; reproduction


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