Limited dependence of the human sex ratio on birth order and parental ages.

Abstract

The effects of birth order paternal age and maternal age on sex ratio at birth are presented as a reevaluation of data reported by Novitski and Kimball in 1958. The Mantel-Haenszel chi-squared procedure for obtaining unconfounded effects is used. There was a significant negative effect of birth order on sex ratio (p less than .00001). No significant effect on sex ratio was found for paternal age except for a significant negative effect for first births and a slight positive correlation at birth orders 4 or more. There was no consistent effect of maternal age.

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