Document Detail

Month of birth related to fecundity and childlessness among contemporary women.
MedLine Citation:
PMID:  18478964     Owner:  NLM     Status:  MEDLINE    
To determine the associations of fecundity and childlessness with month of conception and to find a causal mechanism for these associations, we reanalyzed some of our previous data according to the predictions of the seasonal optimal ripening oocyte (SOptRO) and seasonal preovulatory over-ripeness ovopathy (SPrOO) hypotheses. Prime and minor SOptRO months as well as high-risk, no-risk, and very high risk SPrOO months were defined on the basis of a priori knowledge of the existence of ovulatory and anovulatory seasons in mammals and of the general birth distribution in Europe. The month of birth was assessed among 899 mothers with three or more children and 388 childless women extracted from a 1% sample of the Austrian population. The women with three or more children were born in excess during the prime and less often during the minor SOptRO months (chi2 = 2.81; p = 0.045; relative risk = 1.16; 95% CI = 1.01-1.33). This is in line with the SOptRO predictions. The childless women were more frequently born during the high-risk SPrOO months compared to the no-risk months but less often during the very high risk months. The linear trend (chi2 = 8.43; p = 0.009) is in line with the SPrOO predictions. We suggest that fecundity and childlessness are dependent on the gradient of oocyte maturation reflected by mother's month of birth, which may modulate future constitution.
P H Jongbloet; H M M Groenewoud; S Huber; M Fieder; N Roeleveld
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Human biology     Volume:  79     ISSN:  0018-7143     ISO Abbreviation:  Hum. Biol.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2008-05-15     Completed Date:  2008-06-05     Revised Date:  2011-04-18    
Medline Journal Info:
Nlm Unique ID:  0116717     Medline TA:  Hum Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  479-90     Citation Subset:  IM    
Department of Epidemiology and Biostatistics, Nijmegen Medical Centre, Radboud University, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
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MeSH Terms
Austria / epidemiology
Birth Rate
Fertile Period / physiology
Fertility / physiology*
Ovulation / physiology
Reproductive History

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