Document Detail


Preterm birth in Sweden 1973-2001: rate, subgroups, and effect of changing patterns in multiple births, maternal age, and smoking.
MedLine Citation:
PMID:  15901267     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The objectives of this report are to evaluate changes in the preterm birth rate in Sweden 1973-2001. Furthermore, describe the proportion of spontaneous and indicated preterm births and assess risk factors for the subgroups of preterm birth during the period from 1991 to 2001. METHODS: A population-based register study of all births occurring in Sweden from 1973 to 2001 registered in the Swedish Medical Birth Register was designed. The analysis of subgroups was restricted to the period 1991-2001. Gestational age was calculated using last menstrual period and best estimate. Odds ratio for preterm birth related to risk factors was calculated for the subgroups' spontaneous and indicated preterm birth. RESULTS: After an increase in the beginning of the 1980s, the preterm birth rate has decreased from 6.3% in 1984 to 5.6% in 2001 (P < 0.0001). The proportion of multiple births born preterm of the total birth rate increased from 0.34% in 1973 to 0.71% in 2001 (P < 0.0001). Spontaneous preterm births account for 55.2% and iatrogenic preterm births for 20.2% of all preterm births. The strongest association with maternal smoking in early pregnancy was found at gestational age <28 weeks and spontaneous preterm birth [odds ratio (OR) smoking versus no smoking: 1.55, 95% confidence intervals (CI): 1.42-1.69]. The strongest association for maternal age was found between gestational age <28 weeks and indicated preterm birth (OR 5-year increase: 1.34, 95% CI: 1.21-1.47). CONCLUSIONS: The preterm birth rate in Sweden has decreased since the mid 1980s. The composition of different subtypes of preterm birth in a Scandinavian low-risk population seems to be similar to populations with higher incidence of preterm birth and perinatal infections.
Authors:
Nils-Halvdan Morken; Karin Källen; Henrik Hagberg; Bo Jacobsson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta obstetricia et gynecologica Scandinavica     Volume:  84     ISSN:  0001-6349     ISO Abbreviation:  Acta Obstet Gynecol Scand     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-19     Completed Date:  2005-06-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370343     Medline TA:  Acta Obstet Gynecol Scand     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  558-65     Citation Subset:  IM    
Affiliation:
Department of Obstetrics and Gynecology, Telemark Hospital, Skien, Norway. nhmorken@online.no
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MeSH Terms
Descriptor/Qualifier:
Adult
Female
Gestational Age
Humans
Maternal Age
Maternal Welfare / trends
Obstetric Labor, Premature / epidemiology*,  etiology
Pregnancy
Pregnancy, Multiple
Registries
Risk Factors
Smoking
Sweden / epidemiology

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


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