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Birth weight and related variables for offspring of mothers aged 42 or more years

Birth weight and related variables for offspring of mothers aged 42 or more years Summary Birth weight and related variables are analysed in a sample of 960 babies born in three Swedish Maternity Clinics to mothers aged 42 years on more. The sample is analysed by sex and survival (1 week), and means and standard deviation are calculated accordingly. Correlation and partial correlation and analysis show that the variation in birth weight, which increases with parity, is associated more with succession of births than with parental ages. There is a significant deviation from independence of sex ratio with parity, and the highest contribution to x2 is given by the first parity. There is found a significant parabolic regression of sex ratio on parity. This indicates that parity per se is more relevant in determining the slight changes in sex ratio than parental ages, of which they are independent. The proportion of non‐survivors is significantly higher than the comparable incidence for the general population of births in Sweden. The birth weight associated with the lowest mortality is higher than the means in both males and females. This has been estimated by the use of the 2 value of Penrose. During the preparation of this paper M. Fraccaro was a guest of the Gruppo di Ricerca 3B del CNEN, at the Institute of Genetics, Pavia. He wishes to thank Prof. L. L. Cavalli Sforza for his kind hospitality. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Human Genetics Wiley

Birth weight and related variables for offspring of mothers aged 42 or more years

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References (35)

Publisher
Wiley
Copyright
Copyright © 1962 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0003-4800
eISSN
1469-1809
DOI
10.1111/j.1469-1809.1962.tb01519.x
Publisher site
See Article on Publisher Site

Abstract

Summary Birth weight and related variables are analysed in a sample of 960 babies born in three Swedish Maternity Clinics to mothers aged 42 years on more. The sample is analysed by sex and survival (1 week), and means and standard deviation are calculated accordingly. Correlation and partial correlation and analysis show that the variation in birth weight, which increases with parity, is associated more with succession of births than with parental ages. There is a significant deviation from independence of sex ratio with parity, and the highest contribution to x2 is given by the first parity. There is found a significant parabolic regression of sex ratio on parity. This indicates that parity per se is more relevant in determining the slight changes in sex ratio than parental ages, of which they are independent. The proportion of non‐survivors is significantly higher than the comparable incidence for the general population of births in Sweden. The birth weight associated with the lowest mortality is higher than the means in both males and females. This has been estimated by the use of the 2 value of Penrose. During the preparation of this paper M. Fraccaro was a guest of the Gruppo di Ricerca 3B del CNEN, at the Institute of Genetics, Pavia. He wishes to thank Prof. L. L. Cavalli Sforza for his kind hospitality.

Journal

Annals of Human Genetics – Wiley

Published: Mar 1, 1962

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