日本的第二性征比例、父亲年龄、母亲年龄及出生顺序

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

作者信息

Imaizumi Y, Murata M

出版信息

Ann Hum Genet. 1979 May;42(4):457-65. doi: 10.1111/j.1469-1809.1979.tb00679.x.

DOI:10.1111/j.1469-1809.1979.tb00679.x

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.

摘要

利用1975 - 1976年期间在日本发生的超过370万例出生数据，研究了几个变量对第二性别比的同时影响。观察到性别比与出生顺序之间存在微弱的负相关，但在统计意义上并不显著。当控制母亲年龄时，得到了父亲年龄与出生顺序相互作用的负面影响。在解释性别比变异性方面，二次模型比线性模型更有效。