Ambient Temperature and Early Delivery of Singleton Pregnancies.

ABSTRACT:

Background

Extreme temperature is associated with adverse birth outcomes but it is unclear whether it increases early delivery risk.

Objectives

We aimed to determine the association between ambient temperature and early delivery.

Methods

Medical records from 223,375 singleton deliveries from 12 U.S. sites were linked to local ambient temperature. Exposure to hot (> 90th percentile) or cold (< 10th percentile) using site-specific and window-specific temperature distributions were defined for 3-months preconception, 7-week periods during the first two trimesters, 1 week preceding delivery, and whole pregnancy. Poisson regression with generalized estimating equations calculated the relative risk (RR) and 95% confidence interval for early deliveries associated with hot/co

SUBMITTER: Ha S 

PROVIDER: S-EPMC5332199 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature