, Volume 86, Issue 7, pp 340-342

Sex Ratios at Birth and Environmental Temperatures

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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.

Received: 26 August 1998 / Accepted in revised form: 18 February 1999