Document Detail

Male gender predisposes to prolongation of pregnancy.
MedLine Citation:
PMID:  12389008     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to evaluate the association between fetal gender and prolonged pregnancy. STUDY DESIGN: All deliveries in Sweden between 1987 and 1996 were evaluated for participation in this study. Inclusion criteria included (1) singleton pregnancy, (2) the absence of apparent congenital or chromosomal anomalies, (3) accurate dating established by early second trimester ultrasound examination, and (4) gestational age at delivery of > or =37 weeks (ie, > or =259 days). Initially, we calculated the mean gestational age at delivery and the percentage of prolonged pregnancies by fetal gender. Subsequently, the Mantel-Haenszel chi-square analysis was used to calculate the weekly odds ratios and their corresponding 95% confidence intervals for the delivery of a male fetus beyond 37 weeks of gestation. RESULTS: The study population comprised 656,423 deliveries; 333,192 were male deliveries, and 323,231 were female deliveries (male/female ratio, 1.03). The mean gestational age at delivery was significantly higher in male fetuses (280.6 +/- 8.9 days vs 279.8 +/- 8.6 days, respectively; P <.0001). The percentage of pregnancies that delivered beyond term was significantly higher for male relative to female fetuses (26.5% vs 22.5% [P <.000001] at > or =41 weeks of gestation and 7.6% vs 5.5% [P <.000001] at > or =42 weeks of gestation, respectively). The weekly odds ratios for a delivery of a male fetus beyond term were 1.14, 1.39, and 1.50 at 41, 42, and 43 weeks, respectively. CONCLUSION: Male gender significantly predisposes to the prolongation of pregnancy to the extent that, by 43 weeks of gestation, there are 3 male deliveries for every 2 female deliveries.
Michael Y Divon; Asaf Ferber; Henry Nisell; Magnus Westgren
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of obstetrics and gynecology     Volume:  187     ISSN:  0002-9378     ISO Abbreviation:  Am. J. Obstet. Gynecol.     Publication Date:  2002 Oct 
Date Detail:
Created Date:  2002-10-21     Completed Date:  2002-11-19     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370476     Medline TA:  Am J Obstet Gynecol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1081-3     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynecology, Lenox-Hill Hospital, 100 E. 77th Street, New York, NY 10021, USA.
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MeSH Terms
Fetus / physiology*
Gestational Age
Odds Ratio
Pregnancy, Prolonged*
Sex Characteristics*
Sex Ratio
Comment In:
Am J Obstet Gynecol. 2003 Jun;188(6):1665-6; author reply 1666   [PMID:  12825023 ]
Am J Obstet Gynecol. 2004 Apr;190(4):1169-70   [PMID:  15132155 ]

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

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