Document Detail

Seasonal patterns and preterm birth: a systematic review of the literature and an analysis in a London-based cohort.
MedLine Citation:
PMID:  17120349     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The objectives of this study included a systematic review of the countries in which a seasonal pattern of preterm birth has been reported and an analysis on the seasonal variability of preterm birth in a London-based cohort. DESIGN: Cross-sectional study. SETTING: Eighteen maternity units in a London health region from 1988 to 2000. POPULATION: The study population comprised 482,765, live singleton births born after 24 weeks of gestation and weighing more than 200 g. METHODS: Systematic review and secondary analysis of seasonality over 13 years of births from the St Mary's Maternity Information System (SMMIS). MAIN OUTCOME MEASURE: Annual patterns of preterm birth and a comparison of risk by seasons. RESULTS: Three studies from developing countries and three from developed countries reported a seasonal pattern of preterm birth. One study from the USA reported no seasonal pattern of preterm birth. No British studies were located. Rates of preterm birth in developed countries were highest twice a year (once in winter and again in summer). In London (SMMIS data set), however, preterm births peaked only once a year, in winter. Babies born in winter were 10% more likely to be preterm compared with those born in spring (OR 1.10, 95% CI 1.07-1.14). CONCLUSION: Establishing a seasonal pattern of birth can have important implications for the delivery of healthcare services. Most studies from both developed and developing countries support the existence of preterm birth seasonality. This study has shown that the seasonality of preterm births in this London-based cohort differs from other developed countries that have previously reported a seasonal pattern of preterm birth.
S J Lee; P J Steer; V Filippi
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Publication Detail:
Type:  Journal Article; Multicenter Study; Review    
Journal Detail:
Title:  BJOG : an international journal of obstetrics and gynaecology     Volume:  113     ISSN:  1470-0328     ISO Abbreviation:  BJOG     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-11-21     Completed Date:  2007-01-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100935741     Medline TA:  BJOG     Country:  England    
Other Details:
Languages:  eng     Pagination:  1280-8     Citation Subset:  AIM; IM    
London School of Hygiene and Tropical Medicine, Infectious and Tropical Diseases, Infectious Disease Epidemiology Unit, London, UK.
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MeSH Terms
Cohort Studies
Cross-Sectional Studies
London / epidemiology
Premature Birth / epidemiology*
Risk Factors

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