Document Detail

Month of birth by zygosity in the NAS-NRC twin registry.
MedLine Citation:
PMID:  6650099     Owner:  NLM     Status:  MEDLINE    
Previous results regarding a seasonality of twin births have been conflicting. Since the biology of monozygotic (MZ) twinning differs from that of dizygotic (DZ) twinning, it is possible that the seasonality of birth for these two twin types might differ. However, all previous studies examining the seasonality of birth by zygosity has estimated zygosity by Weinberg's method. In this report, the month of birth of all MZ and DZ veteran twins from the United States National Academy of Sciences-National Research Council (NAS-NRC) Twin Registry are compared with that found for an unselected group of veterans. Zygosity in the registry has been individually assigned to all twin pairs by a well-validated method. Compared to unselected veterans, the distribution of births by months did not differ significantly for all the veteran twin pairs or for the MZ and DZ twin pairs considered separately. The distribution of month of birth of the MZ and DZ twin pairs did not differ significantly from one another. These results are not consistent with a significant seasonality of MZ, DZ, or all twin births in the United States.
K S Kendler; C D Robinette
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Acta geneticae medicae et gemellologiae     Volume:  32     ISSN:  0001-5660     ISO Abbreviation:  Acta Genet Med Gemellol (Roma)     Publication Date:  1983  
Date Detail:
Created Date:  1984-01-07     Completed Date:  1984-01-07     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370314     Medline TA:  Acta Genet Med Gemellol (Roma)     Country:  ITALY    
Other Details:
Languages:  eng     Pagination:  113-6     Citation Subset:  IM    
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MeSH Terms
Pregnancy, Multiple*
Twins, Dizygotic
Twins, Monozygotic
United States
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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