Sex Ratios at Birth and Environmental Temperatures
- Cite this article as:
- Lerchl, A. Naturwissenschaften (1999) 86: 340. doi:10.1007/s001140050630
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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.