Article1979

The secondary sex ratio, paternal age, maternal age and birth order in Japan

21 citations0/0 files storedAnnals of Human Genetics

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Demographic Trends and Gender Preferences Family Dynamics and Relationships Assisted Reproductive Technology and Twin Pregnancy

Abstract

The simultaneous effects of several variables on the secondary sex ratio have been examined using data from over 3.7 million births which occurred in Japan during 1975--6. A weak and negative association between sex ratio and birth order was observed but it was not significant in the statistical sense. A negative effect of paternal age--birth order interaction was obtained when maternal age was controlled. The quadratic model is much more powerful than the linear model in explaining the sex ratio variability.

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1976The secondary sex ratio in the United States 1969–71: Association with race, parental ages, birth order, paternal education and legitimacy 1958Birth order, parental ages, and sex of off-spring.1977Maternal age, parity* social class and sex ratio 1971Limited dependence of the human sex ratio on birth order and parental ages.1954THE EFFECTS OF THE AGE OF THE MOTHER ON THE SEX RATIO AT BIRTH IN JAPAN 1976A multivariate analysis of the relationship between parental age and birth order and the human secondary sex ratio

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1981The changing sex ratio in Japan

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