Evidence map›Paper›PMID 30992027›Full record

ArticleReproductive health2019

A gestational vulnerability window for smoking exposure and the increased risk of preterm birth: how timing and intensity of maternal smoking matter.

Anthony J Kondracki, Sandra L Hofferth

Abstract read
In one paragraph

Article in Reproductive health, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
–field-weighted citation impact
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.

  1. Maternal Smoking and Preterm Birth Among Infants With Orofacial Clefts.The Cleft palate-craniofacial journal : official publication of the American Cleft Palate-Craniofacial Association · 2026
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  3. A Scoping Review of Preterm Birth Risk Factors.American journal of perinatology · 2024
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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

2 authors.

Anthony J KondrackiSchool of Public Health, Department of Family Science, University of Maryland, 4200 Valley Drive, College Park, MD, 20742, USA. akondrac@umd.edu.ORCID http://orcid.org/0000-0002-7328-0248
Sandra L HofferthSchool of Public Health, Department of Family Science, University of Maryland, 4200 Valley Drive, College Park, MD, 20742, USA.

Funding

Time Use Data for Health and Well-BeingR01HD053654 · NICHD · UNIV OF MARYLAND, COLLEGE PARK · PI Sarah M Flood, Liana C Sayer · 2006 to 2026
$11.5M
MARYLAND POPULATION RESEARCH CENTERR24HD041041 · NICHD · UNIV OF MARYLAND, COLLEGE PARK · PI RENDALL, MICHAEL S. · 2001 to 2016
$6.6M
Eunice Kennedy Shriver National Institute of Child Health and Human Development R01-HD053654NICHD NIH HHS R01 HD053654NICHD NIH HHS R24 HD041041
6 · The paper itself

Abstract

backgroundReducing the incidence of preterm birth is a national priority. Maternal cigarette smoking is strongly and consistently associated with preterm birth. The objective of this study was to examine prenatal exposure based on combined measures of timing (by trimester) and intensity level (the number of cigarettes smoked per day) of maternal smoking to identify a pregnancy period with the highest risk of preterm birth.

methodsA sample of 2,485,743 singleton births was drawn from the 2010 National Center of Health Statistics (NCHS) linked birth/infant death file of US residents in 33 states that implemented the revised 2003 birth certificate. Nine mutually exclusive smoking status categories were created to assess prenatal exposure across pregnancy in association with preterm birth. Gestational age was based on the obstetric estimate. Multiple logistic regression analyses were conducted to compare the odds of preterm birth among women who smoked at different intensity levels in the second or third trimester with those who smoked only in the first trimester.

resultsOverall, 7.95% of women had a preterm birth; 8.90% of low intensity (less than a pack/day) smokers in the first trimester only, 12.99% of low and 15.38% of high intensity (pack a day or more) smokers in the first two trimesters, and 10.56% of low and 11.35% of high intensity smokers in all three trimesters delivered preterm. First and second trimester high (aOR 1.85, 95% CI: 1.66, 2.06) and low intensity smokers (aOR 1.51, 95% CI: 1.41, 1.61) had higher odds of preterm birth compared to those who smoked less than a pack a day only in the first trimester, but the odds did not increase for all three trimester smokers relative to the first and second trimester smokers. In sensitivity analysis, adjustment for exposure misclassification error corrected data and testing for effect modification by maternal race/ethnicity found no significant interaction.

conclusionsThis study documented a biologically plausible vulnerability window for smoking exposure and the increased risk of preterm birth. For women who do not modify their smoking behavior preconception, preterm birth risk of smoking remains low until late in the first trimester.

Indexed as

Prenatal Exposure Delayed EffectsAdultFemaleGestational AgeHumansInfant, NewbornInfant, Small for Gestational AgePregnancyPregnancy TrimestersPremature BirthRisk FactorsSmokingTime FactorsCessationPregnancyPreterm birthTiming of smokingTrimester

Identifiers

PMID30992027
PMCPMC6469085

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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.