Document Detail


Time to pregnancy--a model and its application.
MedLine Citation:
PMID:  2335546     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Biological fertility is poorly measured by the number of children born in industrially advanced societies. The time elapsing from when a couple decides to have a child to clinically recognizable pregnancy is a useful alternative. Time to pregnancy can be collected in broad categories in large samples. A model for condensing important information from such data is presented, which fits several large samples of reported waiting times. It is shown that multiparous women conceive more quickly than primiparous women.
Biological fertility is poorly measured by the number of children born in industrially advances societies. The deliberate intervention in human reproduction in many European countries has led to a declining fertility that is no gauge on the ability to reproduce which is of considerable epidemiological interest. Time to pregnancy can be collected in broad categories in large samples. A model condensing important information from such data is presented. In the model it is assumed that mean waiting time to pregnancy is constant for each couple but differs among couples, and that conceptions take place in continuous time (i.e. conceive not only once in each menstrual cycle). The data analyzed consisted of 3 studies where subjects replied to the question 'for how long did you try to become pregnant before you succeeded?'. 2 studies involved Danish mothers who recently gave birth and 1 study questioned pharmacy assistants who gave birth to a single live-born child. The model presented fits several large samples of reported waiting times. It is shown that multiparous women conceive more quickly than primiparous women. The model fits short and moderate waiting times but not long and very long waiting times.
Authors:
J L Boldsen; I Schaumburg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biosocial science     Volume:  22     ISSN:  0021-9320     ISO Abbreviation:  J Biosoc Sci     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-06-14     Completed Date:  1990-06-14     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0177346     Medline TA:  J Biosoc Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  255-62     Citation Subset:  IM; J    
Affiliation:
Department of Social Medicine, University of Odense, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Birth Intervals*
Denmark
Female
Humans
Models, Statistical
Parity*
Pregnancy

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


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