Document Detail

The effect on human sex ratio at birth by assisted reproductive technology (ART) procedures--an assessment of babies born following single embryo transfers, Australia and New Zealand, 2002-2006.
MedLine Citation:
PMID:  20875033     Owner:  NLM     Status:  In-Process    
OBJECTIVE: To assess the effect on the human sex ratio at birth by assisted reproductive technology (ART) procedures.
DESIGN: Retrospective population-based study.
SETTING: Fertility clinics in Australia and New Zealand.
POPULATION: The study included 13,368 babies by 13,165 women who had a single embryo transfer (SET) between 2002 and 2006.
METHODS: Logistic regression was used to model the effect on the sex ratio at birth of ART characteristics [in vitro fertilisation (IVF) or intracytoplasmic sperm insemination (ICSI) SET, cleavage-stage or blastocyst SET, and fresh or thawed SET] and biological characteristics (woman's and partner's age and cause of infertility).
MAIN OUTCOME MEASURES: Proportion of male births.
RESULTS: The crude sex ratio at birth was 51.3%. Individual ART procedures had a significant effect on the sex ratio at birth. More males were born following IVF SET (53.0%) than ICSI SET (50.0%), and following blastocyst SET (54.1%) than cleavage-stage SET (49.9%). For a specific ART regimen, IVF blastocyst SET produced more males (56.1%) and ICSI cleavage-stage SET produced fewer males (48.7%).
CONCLUSIONS: The change in the sex ratio at birth of SET babies is associated with the ART regimen. The mechanism of these effects remains unclear. Fertility clinics and patients should be aware of the bias in the sex ratio at birth when using ART procedures.
J H Dean; M G Chapman; E A Sullivan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-28
Journal Detail:
Title:  BJOG : an international journal of obstetrics and gynaecology     Volume:  117     ISSN:  1471-0528     ISO Abbreviation:  BJOG     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100935741     Medline TA:  BJOG     Country:  England    
Other Details:
Languages:  eng     Pagination:  1628-34     Citation Subset:  AIM; IM    
Copyright Information:
© 2010 The Authors Journal compilation © RCOG 2010 BJOG An International Journal of Obstetrics and Gynaecology.
Reproductive and Perinatal Epidemiology Research Unit, The University of New South Wales, NSW, Australia.
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Comment In:
BJOG. 2011 Feb;118(3):381   [PMID:  21226834 ]

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