Factors affecting the sex ratio in large populations

Author:

Teitelbaum Michael S.

Abstract

Summary and conclusionsTo summarize the findings presented here, only three of the five factors studied appear to be independently related to the sex ratio at birth. The significant negative birth-order effect, which in the first analysis accounted for a 2·6% shift in the relative odds of male birth, remained significant when adjustment for the race effect was provided in the second analysis. The magnitude of the effect was diminished by this adjustment, however, indicating that analysis for birth-order effects in the absence of adjustment for the race factor may lead to over-estimates of the importance of the birth-order factor.The significant race effect detected in the second analysis resulted in a 3% lower relative odds for a Negro male birth than that for a white. This racial difference, coupled with the non-uniform distribution of Negro births by paternal-age and birth-order categories, appears to be the source of the mysterious ‘interaction effect’ between birth order and paternal age reported by Novitski & Kimball. The race effect remained significant after adjustment was provided for both the birthorder and socio-economic effects.

Publisher

Cambridge University Press (CUP)

Subject

Public Health, Environmental and Occupational Health,General Social Sciences

Reference23 articles.

1. Determinants of Sex Proportions in Man, with Consideration of the Evidence Concerning a Contribution from X-linked Mutations to Intrauterine Death

2. The relation between the occupational status of individuals and the sex ratio of their offspring;Fancher;Hum. Biol.,1956

3. Statistical aspects of the analysis of data from retrospective studies of disease;Mantel;J. natn. Cancer Inst.,1959

4. Birth order, parental ages and sex of offspring;Novitski;Am. J. hum. Genet.,1958

Cited by 80 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3