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Sex Ratio of Offspring of Females Exposed to Low-Level High-Frequency Electromagnetic Radiation.
Last modified on:
Wednesday, November 05, 2008 16:53:06
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The possibility that high-frequency electromagnetic radiation (EMR) exposure could influence the sex ratio of offspring of female physiotherapists was discussed based on results of another study which reported that Danish physiotherapists exposed to low-level EMR gave birth to a highly significant, dose-related excess of daughters (BENER Abstract No. 5889). The author suggested that workers in occupational medicine might consider using the sex ratio (proportion of males) of offspring as an indicator of reproductive risk. An excess of female births, however, does not necessarily indicate pathology. [BENER 12504]
READER COMMENTS
March 5, 1997 - Dr. Joseph van den Broek, BIOnieuws (josbroek@euronet.nl)
For a proper statistical analysis of changing sex ratios large numbers of newborns are obligatory. How large is the number of physiotherapists (and the newborn boys and girls) involved? [Editor's Reply: This summary is not of an original study, but rather, of a comment on the original study. The original study, took a sampling of 4021 members of the Danish Union of Physiotherapists meeting the study criteria, in which 1580 singlet births were identified. Of these births, a random sample of 316 pregnancies was taken from the cohort and 264 noncase pregnancies were identified to form the referent group.]
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