Evidence map›Paper›PMID 32421729›Full record

ArticlePloS one2020

Temperature and preeclampsia: Epidemiological evidence that perturbation in maternal heat homeostasis affects pregnancy outcome.

Sagi Shashar, Itai Kloog, Offer Erez, Alexandra Shtein, Maayan Yitshak-Sade, Batia Sarov, Lena Novack

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed, 3 pooled it
2.8field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

33 citing papers in PubMed, 3 syntheses or guidelines pooled it, 73 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 2 institutions in 2 countries.

Sagi ShasharClinical Research Center, Soroka University Medical Center, Ben-Gurion University of the Negev, Beersheba, Israel.ORCID 0000-0002-2386-8027
Itai KloogDepartment of Geography and Environmental Development, Faculty of Humanities and Social Sciences, Ben Gurion University, Beersheba, Israel.
Offer ErezDivision of Obstetrics and Gynecology, Maternity Department "D", Soroka University Medical Center, Ben-Gurion University of the Negev, Beersheba, Israel.
Alexandra ShteinDepartment of Geography and Environmental Development, Faculty of Humanities and Social Sciences, Ben Gurion University, Beersheba, Israel.
Maayan Yitshak-SadeDepartment of Environmental Health Exposure, Epidemiology, and Risk Program Harvard T.H. Chan School of Public Health, Boston, Massachusetts, United States of America.
Batia SarovDepartment of Public Health, Faculty of Heath Sciences, Ben-Gurion University of the Negev, Beersheba, Israel.
Lena NovackClinical Research Center, Soroka University Medical Center, Ben-Gurion University of the Negev, Beersheba, Israel.
Ben-Gurion University of the Negev · ILHarvard University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionThis study aims to determine the association between temperature and preeclampsia and whether it is affected by seasonality and rural/urban lifestyle.

methodsThis cohort study included women who delivered at our medical center from 2004 to 2013 (31,101 women, 64,566 deliveries). Temperature values were obtained from a spatiotemporally resolved estimation model performing predictions at a 1×1km spatial resolution. In "Warm" pregnancies >50% of gestation occurred during the spring-summer period. In cold pregnancies >50% of gestation occurred during the fall and winter. Generalized estimating equation multivariable models were used to estimate the association between temperature and incidence of preeclampsia.

results1) The incidence of preeclampsia in at least one pregnancy was 7% (2173/64,566); 2) during "warm" pregnancies, an elevation of one IQR of the average temperature in the 1st or the 3rd trimesters was associated with an increased risk to develop preeclampsia [patients with Jewish ethnicity: 1st trimester: relative risk (RR) of 2.38(95%CI 1.50; 3.80), 3rd trimester 1.94(95%CI 1.34;2.81); Bedouins: 1st trimester: RR = 2.91(95%CI 1.98;4.28), 3rd trimester: RR = 2.37(95%CI 1.75;3.20)]; 3) In "cold" pregnancies, an elevation of one IQR of average temperature was associated with a lower risk to develop preeclampsia among patients with Bedouin-Arab ethnicity RR = 0.68 (95% CI 0.49-0.94) for 1st trimester and RR = 0.62 (95% CI 0.44-0.87) for 3rd trimester.

conclusions1) Elevated averaged temperature during the 1st or 3rd trimesters in "warm" pregnancies confer an increased risk for the development of preeclampsia, especially in nomadic patients; 2) Of interest, during cold pregnancies, elevated averaged temperature was associated with a lower risk to develop preeclampsia for nomadic patients. 3) These findings suggest temperature might be associated with perturbations in maternal heat homeostasis resulting in reallocation of energy resources and their availability to the fetus that may increase the risk for preeclampsia. This observation is especially relevant in the context of global warming and its effects on maternal/fetal reproductive health.

Indexed as

TemperatureAdolescentAdultCohort StudiesFemaleHomeostasisHumansIncidenceMiddle AgedPre-EclampsiaPregnancyPregnancy OutcomeRisk FactorsRural PopulationSeasonsUrban Population

Identifiers

PMID32421729
PMCPMC7234374
OpenAlexW3026747336

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.