Letters

Authors' reply (Finland)

BMJ 1994; 308 doi: http://dx.doi.org/10.1136/bmj.308.6937.1163 (Published 30 April 1994) Cite this as: BMJ 1994;308:1163
  1. Pia K Verkasalo,
  2. Kauko V Heikkila,
  3. Eero Pukkala,
  4. Mikko Y Hongisto,
  5. Jorma E Valjus,
  6. Pekka J Jarvinen,
  7. Markku Koskenvuo
  1. Research scientist, Systems analyst, Department of Public Health, PO Box 52 (Mannerheimintic 96 A), SF-00014, Helsinki, Finland
  2. Research scientist, Finnish Cancer Registry, Institute for Statistical and Epidemiological, Cancer Research, SF-00170 Helsinki
  3. Research engineer, Research manager, Research manager, Imatran Voima Oy, SF-01019, Professor, Department of Public Health, University of Turku, LemminkaISENKATU 1, SF-20520 TURKU.

    EDITOR,--We are well aware that magnetic fields from sources other than power lines will, if carcinogenic, mask and decrease the observed association. Our exposure assessment was based on the assumption that magnetic fields of high voltage power lines usually increase the overall exposures of children living in the vicinity of the lines compared with other children. Calculation of magnetic fields generated by power lines provided no more than a tool for classifying study subjects according to their overall exposure levels. The subcohorts of children with maximal annual average exposure of >/=0.20 μT or cumulative exposure of >/=0.40 μT years were considered to be exposed in our study; the rest were investigated solely to compare …

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