Evidence map›Paper›PMID 33232573›Full record

ArticleBJOG : an international journal of obstetrics and gynaecology2021

Associations between interpregnancy interval and preterm birth by previous preterm birth status in four high-income countries: a cohort study.

M L Marinovich, A K Regan, M Gissler, M C Magnus, S E Håberg, J A Mayo, G M Shaw, J Bell, N Nassar, S Ball and 6 more

Abstract readMulticenter Study
PubMed Full text at PMC Publisher
In one paragraph

Article in BJOG : an international journal of obstetrics and gynaecology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed, 2 pooled it
2.9field-weighted citation impact, top 8% 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

12 citing papers in PubMed, 2 syntheses or guidelines pooled it, 26 citations in OpenAlex.

  1. Pooled it
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  11. A Scoping Review of Preterm Births in Sub-Saharan Africa: Burden, Risk Factors and Outcomes.International journal of environmental research and public health · 2022
    Article
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

16 authors at 9 institutions in 7 countries.

M L MarinovichSchool of Public Health, Curtin University, Perth, WA, Australia.
A K ReganSchool of Public Health, Texas A&M University, College Station, TX, USA.
M GisslerInformation Services Department, Finnish Institute for Health and Welfare, Helsinki, Finland.
M C MagnusMRC Integrative Epidemiology Unit at the University of Bristol, Bristol, UK.
S E HåbergCentre for Fertility and Health (CeFH), Norwegian Institute of Public Health, Oslo, Norway.
J A MayoDepartment of Pediatrics, March of Dimes Prematurity Research Center, Stanford University, Stanford, CA, USA.
G M ShawDepartment of Pediatrics, March of Dimes Prematurity Research Center, Stanford University, Stanford, CA, USA.
J BellChildren's Hospital at Westmead Clinical School, University of Sydney, Sydney, NSW, Australia.
N NassarChildren's Hospital at Westmead Clinical School, University of Sydney, Sydney, NSW, Australia.
S BallSchool of Nursing, Midwifery and Paramedicine, Curtin University, Perth, WA, Australia.
A T GebremedhinSchool of Public Health, Curtin University, Perth, WA, Australia.ORCID 0000-0003-2459-1805
C MarstonFaculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK.
N de KlerkTelethon Kids Institute, University of Western Australia, Subiaco, WA, Australia.
A P BetránDepartment of Reproductive Health and Research, UNDP/UNFPA, UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction, World Health Organization, Geneva, Switzerland.ORCID 0000-0002-5631-5883
A M PadulaDepartment of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, CA, USA.
G PereiraSchool of Public Health, Curtin University, Perth, WA, Australia.
Curtin University · AUNorwegian Institute of Public Health · NOMarch of Dimes · USThe University of Sydney · AUUniversity of California, San Francisco · USKarolinska Institutet · SELondon School of Hygiene & Tropical Medicine · GBTexas A&M University · USThe Kids Research Institute Australia · AU

Funding

Traffic-related Air Pollution, Social Factors and Adverse Birth OutcomesR00ES021470 · NIEHS · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI PADULA, AMY MICHELLE · 2016 to 2018
$746k
Interpregnancy intervals and pregnancy outcomes in CaliforniaR03HD090243 · NICHD · STANFORD UNIVERSITY · PI SHAW, GARY M · 2017 to 2018
$157k
Medical Research Council MC_UU_12013/5Medical Research Council MR/M009351/1NICHD NIH HHS R03 HD090243NIEHS NIH HHS R00 ES021470World Health Organization 001
6 · The paper itself

Abstract

objectiveTo investigate the effect of interpregnancy interval (IPI) on preterm birth (PTB) according to whether the previous birth was preterm or term.

designCohort study.

settingUSA (California), Australia, Finland, Norway (1980-2017). POPULATION: Women who gave birth to first and second (n = 3 213 855) singleton livebirths.

methodsOdds ratios (ORs) for PTB according to IPIs were modelled using logistic regression with prognostic score stratification for potential confounders. Within-site ORs were pooled by random effects meta-analysis. OUTCOME MEASURE: PTB (gestational age <37 weeks).

resultsAbsolute risk of PTB for each IPI was 3-6% after a previous term birth and 17-22% after previous PTB. ORs for PTB differed between previous term and preterm births in all countries (P-for-interaction ≤ 0.001). For women with a previous term birth, pooled ORs were increased for IPI <6 months (OR 1.50, 95% CI 1.43-1.58); 6-11 months (OR 1.10, 95% CI 1.04-1.16); 24-59 months (OR 1.16, 95% CI 1.13-1.18); and ≥ 60 months (OR 1.72, 95%CI 1.60-1.86), compared with 18-23 months. For previous PTB, ORs were increased for <6 months (OR 1.30, 95% CI 1.18-1.42) and ≥60 months (OR 1.29, 95% CI 1.17-1.42), but were less than ORs among women with a previous term birth (P < 0.05).

conclusionsAssociations between IPI and PTB are modified by whether or not the previous pregnancy was preterm. ORs for short and long IPIs were higher among women with a previous term birth than a previous PTB, which for short IPI is consistent with the maternal depletion hypothesis. Given the high risk of recurrence and assuming a causal association between IPI and PTB, IPI remains a potentially modifiable risk factor for women with previous PTB. TWEETABLE ABSTRACT: Short versus long interpregnancy intervals associated with higher ORs for preterm birth (PTB) after a previous PTB.

Indexed as

Birth IntervalsAdolescentAdultCaliforniaCohort StudiesDeveloped CountriesFemaleFinlandHumansLongitudinal StudiesNew South WalesNorwayOdds RatioPregnancyPremature BirthRisk FactorsEffect modificationinterpregnancy intervalpreterm birth

Identifiers

PMID33232573
PMCPMC13648956
OpenAlexW3107060842

What OpenQuestion holds

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Registered trials

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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.