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Human Reproduction, Vol. 14, No. 8, 2177A-2178, August 1999
© 1999 European Society of Human Reproduction and Embryology

Letters to the Editor

The status of the hypothesis that the human sex ratio at birth is associated with the cycle day of conception

William H. James

The Galton Laboratory, University College London, 4 Stephenson Way, London NW1 2HE, UK

Dear Sir,

Data have been published (Gray et al., 1998Go) suggesting that the sexes of human offspring are not related to their cycle day of conception. These authors acknowledged that with their data, they had only around 80% power to detect (at the 5% level of significance) a difference of 20% in the sex ratios (proportions male) of conceptions on the most . . . [Full Text of this Article]

Notes on the Data

References


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