Document Detail


Statistical analysis of the seasonal variation in the twinning rate.
MedLine Citation:
PMID:  10392799     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
There have been few secular analyses of the seasonal variation in human twinning and the results are conflicting. One reason for this is that the seasonal pattern of twinning varies in different populations and at different periods. Another reason is that the statistical methods used are different. The changing pattern of seasonal variation in twinning rates and total maternities in Denmark was traced for three periods (1855-69, 1870-94, and 1937-84). Two alternative methods of analysis are considered. The method of Walter and Elwood and a trigonometric regression model give closely similar results. The seasonal distribution of twin maternities for the periods in the 19th century showed highly significant departures. For both twin and general maternities, the main peaks can be seen from March to June and a local peak in September. During the spring-summer season the twinning rates were higher than the total birth rates, indicating a stronger seasonal variation for the twin maternities than for the general maternities. For 1937-84, there was a similar, but less accentuated, pattern. Studies of other populations are compared with the Danish results. The more accentuated seasonal variation of twinning in the past indicate that some factors in the past affected women during summer-autumn and around Christmas time, making them more fecund and particularly to be more prone to polyovulation and/or more able to complete a gestation with multiple embryos.
Authors:
J Fellman; A W Eriksson
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Twin research : the official journal of the International Society for Twin Studies     Volume:  2     ISSN:  1369-0523     ISO Abbreviation:  Twin Res     Publication Date:  1999 Mar 
Date Detail:
Created Date:  1999-08-19     Completed Date:  1999-08-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9815819     Medline TA:  Twin Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  22-9     Citation Subset:  IM    
Affiliation:
Folkhälsan Institute of Genetics, Population Genetics Unit, Helsinki, Finland. fellman@shh.fi
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MeSH Terms
Descriptor/Qualifier:
Birth Rate
Chi-Square Distribution
Denmark / epidemiology
Female
Fertility
Great Britain / epidemiology
Humans
Illegitimacy / statistics & numerical data
Marital Status / statistics & numerical data
Pregnancy / statistics & numerical data
Pregnancy, Multiple / statistics & numerical data
Regression Analysis
Rural Population / statistics & numerical data
Seasons*
Superovulation
Switzerland / epidemiology
Twins / statistics & numerical data*
Urban Population / statistics & numerical data
Comments/Corrections
Comment In:
Twin Res. 2000 Dec;3(4):337   [PMID:  11463156 ]

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


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