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Human Reproduction, Vol. 15, No. 5, 1205-1206, May 2000
© 2000 European Society of Human Reproduction and Embryology

Letters to the editor

The need for statistical rigour when pooling data from a variety of sources

D.E. Walters

Thorpes, The Grip, Linton, Cambridge CB1 6NR, UK

Dear Sir,

The publication of a letter in a recent issue of Human Reproduction (James, 1999Go) has prompted this present appeal for more statistical rigour when pooling several sets of data to provide a single composite finding. The datasets in question are summarized in Table IGo, which displays the proportions of male offspring for two periods of conception, the `Most fertile' days of the menstrual cycle and the remaining period. A previous paper by Gray et al (1998) had failed to detect any importance for this factor, but James (1999) had assembled the data from five published papers and produced a . . . [Full Text of this Article]

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