, Volume 86, Issue 7, pp 340–342

Sex Ratios at Birth and Environmental Temperatures

  • Alexander Lerchl

DOI: 10.1007/s001140050630

Cite this article as:
Lerchl, A. Naturwissenschaften (1999) 86: 340. doi:10.1007/s001140050630


 The relationship between average monthly air temperature and sex ratios at birth (SRB) was analyzed for children born in Germany during the period 1946–1995. Both the absolute temperature and – more markedly – the monthly temperature deviations from the overall mean were significantly positively correlated with the SRB (P<0.01) when temperatures were time-lagged against the SRB data by –10 or –11 months. It is concluded that the sex of the offspring is partially determined by environmental temperatures prior to conception.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Alexander Lerchl
    • 1
  1. 1.Institute of Reproductive Medicine, University of Münster, Domagkstrasse 11, D-48129 Münster, GermanyDE