Document Detail

High ambient temperature and the risk of preterm delivery.
MedLine Citation:
PMID:  20889619     Owner:  NLM     Status:  MEDLINE    
With temperatures expected to increase because of climate change, it is essential to study the health outcomes of elevated temperature in vulnerable populations, such as expectant mothers. In this study, the authors estimated the association between heat and humidity, as measured by apparent temperature, and preterm delivery. They conducted a case-crossover analysis of almost 60,000 births spanning 16 counties in California that occurred from 1999 to 2006 between May and September. The authors identified cases of preterm birth from a state registry of births, which were combined with meteorologic and air pollution monitoring data based on residential zip code. High ambient temperature was significantly associated with preterm birth for all mothers, regardless of maternal racial/ethnic group, maternal age, maternal education, or sex of the infant. Results indicated that an 8.6% increase (95% confidence interval: 6.0, 11.3) in preterm delivery was associated with a 10°F (5.6°C) increase in weekly average (lag06) apparent temperature. Greater associations were observed for younger mothers, blacks, and Asians. These associations were independent of air pollutants. Given the significant associations for apparent temperature and preterm delivery found in this study, more large-scale studies of temperature and preterm delivery are warranted.
Rupa Basu; Brian Malig; Bart Ostro
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Publication Detail:
Type:  Journal Article     Date:  2010-10-01
Journal Detail:
Title:  American journal of epidemiology     Volume:  172     ISSN:  1476-6256     ISO Abbreviation:  Am. J. Epidemiol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-04     Completed Date:  2010-12-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7910653     Medline TA:  Am J Epidemiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1108-17     Citation Subset:  IM    
California Office of Environmental Health Hazard Assessment, Air Pollution Epidemiology Section, Oakland, California 94612, USA.
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MeSH Terms
Birth Certificates
California / epidemiology
Cross-Over Studies
Hot Temperature / adverse effects
Infant, Newborn
Logistic Models
Maternal Age
Pregnancy Outcome / epidemiology*,  ethnology
Premature Birth / epidemiology*,  ethnology,  etiology
Young Adult
Comment In:
Am J Epidemiol. 2010 Nov 15;172(10):1118-20; discussion 1121-2   [PMID:  20889621 ]

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

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