Document Detail

Twinning in New England in the 17th-19th centuries.
MedLine Citation:
PMID:  3330389     Owner:  NLM     Status:  MEDLINE    
Vital records of Saybrook and Plymouth in New England from the 17th century were investigated. Among 8,562 maternities 81 twin maternities were found, the twinning rate being 0.95%. Twinning rate was low at the 1st and 2nd births as compared with the 3rd or later births, and was highest at the 7th and 8th births (1.6%). Twin maternity seemed to be a strong risk factor to terminate reproduction, particularly after 6 or more children had been delivered. The rate of mothers who had any other child ("fertile" mothers) at the 7th or later birth order was significantly lower for twin (13%) than for singleton maternities (63%). Twinning rate also varied by the size of offspring of a mother, and those mothers who had 5 or 6 children showed the highest twinning rate (1.3%). Those fertile mothers who had 7 or more children showed the lowest twinning rate (0.74%), although an exceptionally higher twinning rate was seen at their last births. Elongation of the last birth interval was observed for each group of every family size, and higher twinning rates were generally observed at their last births. Reduction in fecundity and rise in twinning rate seem to have occurred simultaneously at the last stage of the reproductive period of mothers, regardless of their family size.
T Miura; H Kawana; K Nonaka
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Publication Detail:
Type:  Historical Article; Journal Article    
Journal Detail:
Title:  Acta geneticae medicae et gemellologiae     Volume:  36     ISSN:  0001-5660     ISO Abbreviation:  Acta Genet Med Gemellol (Roma)     Publication Date:  1987  
Date Detail:
Created Date:  1988-06-29     Completed Date:  1988-06-29     Revised Date:  2004-11-18    
Medline Journal Info:
Nlm Unique ID:  0370314     Medline TA:  Acta Genet Med Gemellol (Roma)     Country:  ITALY    
Other Details:
Languages:  eng     Pagination:  355-64     Citation Subset:  IM; Q    
Department of Hygiene, Teikyo University School of Medicine, Tokyo, Japan.
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MeSH Terms
Birth Intervals
Birth Order
Birth Rate*
Family Characteristics
History, 17th Century
History, 18th Century
History, 19th Century
Maternal Age
New England
Pregnancy, High-Risk

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