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Am J Obstet Gynecol. 2012 Jan;206(1):74.e1-7. doi: 10.1016/j.ajog.2011.07.038. Epub 2011 Jul 30.

Seasonal variation in fetal growth: accounting for sociodemographic, biological, and environmental exposures.

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1
School of Population Health, The University of Western Australia, Crawley, Sydney, New South Wales, Australia. gavin.pereira@uwa.edu.au

Abstract

OBJECTIVE:

We sought to investigate seasonal variation in fetal growth, accounting for important sociodemographic, biological, and environmental exposures.

STUDY DESIGN:

Records of births 1998 through 2006 in Perth, Western Australia were obtained (N = 147,357). We investigated small for gestational age and sex and the proportion of optimal birthweight (POBW) in relation to seasonal exposures (season, temperature, sunlight) by trimester of pregnancy. Adjustment was made for a wide range of risk factors.

RESULTS:

The POBW for neonates with third trimesters predominantly in summer was 0.18% (0.00-0.36%) lower than for those in winter. POBW decreased by 0.14% (0.01-0.27%) per interquartile range increase in third-trimester temperature (9.15°C). An interquartile range increase in temperature over pregnancy (0.73°C) was associated with an odds ratio of 1.02 (95% confidence interval, 1.00-1.05) for small for gestational age and sex.

CONCLUSION:

Reduced fetal growth was associated with elevated ambient temperatures throughout and late in pregnancy, independently of air pollution and other risk factors.

PMID:
21982022
DOI:
10.1016/j.ajog.2011.07.038
[Indexed for MEDLINE]
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