Evidence map›Paper›PMID 33836788›Full record

ArticleReproductive biology and endocrinology : RB&E2021

Thin endometrium is associated with the risk of hypertensive disorders of pregnancy in fresh IVF/ICSI embryo transfer cycles: a retrospective cohort study of 9,266 singleton births.

Xiaojie Liu, Jingwan Wang, Xiao Fu, Jing Li, Meng Zhang, Junhao Yan, Shanshan Gao, Jinlong Ma

Open access · goldAbstract read
In one paragraph

Article in Reproductive biology and endocrinology : RB&E, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
21citing 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

21 citing papers in PubMed, 3 syntheses or guidelines pooled it, 36 citations in OpenAlex.

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  10. Advances in the Pathophysiology of Thin Endometrium.Reproductive sciences (Thousand Oaks, Calif.) · 2025
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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

8 authors at 1 institution in 1 country.

Xiaojie LiuCheeloo College of Medicine, Shandong University, Jinan, China.
Jingwan WangCheeloo College of Medicine, Shandong University, Jinan, China.
Xiao FuCheeloo College of Medicine, Shandong University, Jinan, China.
Jing LiCheeloo College of Medicine, Shandong University, Jinan, China.
Meng ZhangCheeloo College of Medicine, Shandong University, Jinan, China.
Junhao YanCenter for Reproductive Medicine, Shandong University, No.157 Jingliu Road, Jinan, 250021, China.
Shanshan GaoCenter for Reproductive Medicine, Shandong University, No.157 Jingliu Road, Jinan, 250021, China. sdszgaoshanshan@163.com.ORCID http://orcid.org/0000-0003-4355-8365
Jinlong MaCenter for Reproductive Medicine, Shandong University, No.157 Jingliu Road, Jinan, 250021, China. majinlong_sdu@163.com.
Shandong University · CN

Funding

The National Key Research and Development Program of China 2016YFC1000202This study was supported by The National Key Research and Development Program of China 2018YFC1002804
6 · The paper itself

Abstract

backgroundThin endometrial thickness (EMT) has been suggested to be associated with reduced incidence of pregnancy rate after in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) treatment, but the effect of thin endometrium on obstetric outcome is less investigated. This study aims to determine whether EMT affects the incidence of obstetric complications in fresh IVF/ICSI-embryo transfer (ET) cycles.

methodsWe conducted a retrospective cohort study collecting a total of 9266 women who had singleton livebirths after fresh IVF/ICSI-ET treatment cycles at the Center for Reproductive Medicine Affiliated to Shandong University between January 2014 and December 2018. The women were divided into three groups according to the EMT: 544 women with an EMT ≤8 mm, 6234 with an EMT > 8-12 mm, and 2488 with an EMT > 12 mm. The primary outcomes were the incidence of obstetric complications including hypertensive disorders of pregnancy (HDP), gestational diabetes mellitus (GDM), placental abruption, placenta previa, postpartum hemorrhage (PPH) and cesarean section. Multivariable logistic regression analysis was performed to calculate the odds ratios (ORs) and 95% confidence intervals (CIs) for associations between the EMT measured on the day of human chorionic gonadotropin (HCG) trigger and the risk of the outcomes of interest.

resultsThe HDP incidence rate of pregnant women was highest in EMT ≤ 8 mm group and significantly higher than those in EMT from > 8-12 mm and EMT > 12 mm group, respectively (6.8% versus 3.6 and 3.5%, respectively; P = 0.001). After adjustment for confounding variables by multivariate logistic regression analysis, a thin EMT was still statistically significant associated with an increased risk of HDP. Compared with women with an EMT > 8-12 mm, women with an EMT ≤8 mm had an increased risk of HDP (aOR = 1.853, 95% CI 1.281-2.679, P = 0.001).

conclusionA thin endometrium (≤8 mm) was found to be associated with an increased risk of HDP after adjustment for confounding variables, indicating that the thin endometrium itself is a risk factor for HDP. Obstetricians should remain aware of the possibility of HDP when women with a thin EMT achieve pregnancy through fresh IVF/ICSI-ET treatment cycles.

Indexed as

Fertilization in VitroAdultCohort StudiesEmbryo TransferEndometriumFemaleHumansHypertension, Pregnancy-InducedIncidenceMaleOrgan SizePregnancyPregnancy OutcomePregnancy RateRetrospective StudiesRisk FactorsEndometrial thicknessFresh IVF/ICSI embryo transferHypertensive disorders of pregnancyObstetric complicationPerinatal outcome

Identifiers

PMID33836788
PMCPMC8034143
OpenAlexW3142418165

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.