THE RELATIONSHIP BETWEEN PARENTAL AGE, BIRTH ORDER and THE SECONDARY SEX RATIO IN HUMANS*
- 1 November 1956
- journal article
- Published by Wiley in Annals of Human Genetics
- Vol. 21 (2), 123-131
- https://doi.org/10.1111/j.1469-1809.1971.tb00271.x
Abstract
SUMMARY: An analysis is made of the change in secondary sex ratio in humans as the ages of the parents increase, and also as the age of the mother and birth order increases. It is shown that both age of the father and birth order are significantly correlated with this change in sex ratio, whereas the age of the mother is not. The changes with increasing birth order and with increasing age of the father are so similar when properly compared, that they appear quite likely to be caused by the same underlying factor.Keywords
This publication has 5 references indexed in Scilit:
- The Effect of Age of Mother and Birth Order on Sex Ratio at BirthThe Milbank Memorial Fund Quarterly, 1954
- The Dependence of the Secondary Sex Ratio in Humans on the Age of the FatherScience, 1953
- Statistical Analysis in BiologyIchthyology & Herpetology, 1947
- The relative effects of paternal and maternal age in mongolismJournal of Genetics, 1933