1956
DOI: 10.1111/j.1469-1809.1971.tb00271.x
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THE RELATIONSHIP BETWEEN PARENTAL AGE, BIRTH ORDER and THE SECONDARY SEX RATIO IN HUMANS*

Abstract: SUMMARYAn 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. Show more

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Cited by 86 publications
(26 citation statements)
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“…However, in these investigations the other sources of variation had not been explicitly considered, in particular the maternal tendency to generate offspring of one sex, which may be confounded with the positive interaction between sexes in consecutive births. In our analysis, in which Lexian variation between the mothers was considered, the influence of the sex of a birth on the following one, formalized as a non-stationary Markov process, showed a non-significant effect and, when excluded, the reduced (1978), while in humans a negative and significant trend was found by Novitski and Sandler (1956), Novitski and Kimball (1958), Pickles et al (1982) and Crouchley and Pickles (1984).…”
Section: Discussionmentioning
confidence: 97%
“…However, in these investigations the other sources of variation had not been explicitly considered, in particular the maternal tendency to generate offspring of one sex, which may be confounded with the positive interaction between sexes in consecutive births. In our analysis, in which Lexian variation between the mothers was considered, the influence of the sex of a birth on the following one, formalized as a non-stationary Markov process, showed a non-significant effect and, when excluded, the reduced (1978), while in humans a negative and significant trend was found by Novitski and Sandler (1956), Novitski and Kimball (1958), Pickles et al (1982) and Crouchley and Pickles (1984).…”
Section: Discussionmentioning
confidence: 97%
“…Lejeune and Turpin (1957) analysed the same and later United States birth registration statistics and they also were unable to separate maternal and paternal age effects satisfactorily, but concluded that these, rather than parity, were the important variables. Novitski (1953) concluded that the sex ratio was not directly associated with maternal age, but showed an inverse relationship to paternal age, sex proportions being lower in the offspring of older fathers. Novitski and Sandler (1956) calculated multiple linear regressions for data of the United States Bureau of Vital Statistics of the years 1947-1952 inclusive.…”
Section: 8: Effects Of Parental Age and Birthmentioning
confidence: 98%
“…Novitski (1953) concluded that the sex ratio was not directly associated with maternal age, but showed an inverse relationship to paternal age, sex proportions being lower in the offspring of older fathers. Novitski and Sandler (1956) calculated multiple linear regressions for data of the United States Bureau of Vital Statistics of the years 1947-1952 inclusive. They confirmed that the sex ratio of white live births in this population was significantly correlated with paternal and not with maternal age.…”
Section: 8: Effects Of Parental Age and Birthmentioning
confidence: 98%
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