Evidence map›Paper›PMID 26895492›Full record

ArticleEnvironmental health perspectives2016

A Statewide Nested Case-Control Study of Preterm Birth and Air Pollution by Source and Composition: California, 2001-2008.

Olivier Laurent, Jianlin Hu, Lianfa Li, Michael J Kleeman, Scott M Bartell, Myles Cockburn, Loraine Escobedo, Jun Wu

Open access · diamondAbstract read
In one paragraph

Article in Environmental health perspectives, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 56 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
56citing papers in PubMed, 5 pooled it
9.3field-weighted citation impact, top 2% 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

56 citing papers in PubMed, 5 syntheses or guidelines pooled it, 124 citations in OpenAlex.

  1. Systematic review and meta-analysis on the health effects of long-term exposure to ultrafine particles.European respiratory review : an official journal of the European Respiratory Society · 2026
    Pooled it
  2. Pooled it
  3. Maternal fine particulate matter (PMEnvironmental science and pollution research international · 2019
    Pooled it
  4. Pooled it
  5. Pooled it
  6. Trimester-specific exposure to PMBMC pregnancy and childbirth · 2026
    Article
  7. Article
  8. Evaluating Linkage Approaches for Address-Level Socioenvironmental Exposure Assessment.AMIA Joint Summits on Translational Science proceedings. AMIA Joint Summits on Translational Science · 2026
    Article
  9. Article
  10. Review
  11. Modern sources of controls in case-control studies.American journal of epidemiology · 2025
    Article
  12. Article
  13. Exposure to low concentrations of PMBMC public health · 2025
    Article
  14. Quantifying the association between pregnancy exposure to biomass-attributable PMEnvironmental epidemiology (Philadelphia, Pa.) · 2025
    Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
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 4 institutions in 2 countries.

Olivier LaurentProgram in Public Health, University of California, Irvine, Irvine, California, USA.
Jianlin Hu
Lianfa Li
Michael J Kleeman
Scott M Bartell
Myles Cockburn
Loraine Escobedo
Jun Wu
University of California, Irvine · USUniversity of Southern California · USNanjing University of Information Science and Technology · CNUniversity of California, Davis · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundPreterm birth (PTB) has been associated with exposure to air pollution, but it is unclear whether effects might vary among air pollution sources and components.

objectivesWe studied the relationships between PTB and exposure to different components of air pollution, including gases and particulate matter (PM) by size fraction, chemical composition, and sources.

methodsFine and ultrafine PM (respectively, PM2.5 and PM0.1) by source and composition were modeled across California over 2000-2008. Measured PM2.5, nitrogen dioxide, and ozone concentrations were spatially interpolated using empirical Bayesian kriging. Primary traffic emissions at fine scale were modeled using CALINE4 and traffic indices. Data on maternal characteristics, pregnancies, and birth outcomes were obtained from birth certificates. Associations between PTB (n = 442,314) and air pollution exposures defined according to the maternal residence at birth were examined using a nested matched case-control approach. Analyses were adjusted for maternal age, race/ethnicity, education and neighborhood income.

resultsAdjusted odds ratios for PTB in association with interquartile range (IQR) increases in average exposure during pregnancy were 1.133 (95% CI: 1.118, 1.148) for total PM2.5, 1.096 (95% CI: 1.085, 1.108) for ozone, and 1.079 (95% CI: 1.065, 1.093) for nitrogen dioxide. For primary PM, the strongest associations per IQR by source were estimated for onroad gasoline (9-11% increase), followed by onroad diesel (6-8%) and commercial meat cooking (4-7%). For PM2.5 composition, the strongest positive associations per IQR were estimated for nitrate, ammonium, and secondary organic aerosols (11-14%), followed by elemental and organic carbon (2-4%). Associations with local traffic emissions were positive only when analyses were restricted to births with residences geocoded at the tax parcel level.

conclusionsIn our statewide nested case-control study population, exposures to both primary and secondary pollutants were associated with an increase in PTB. CITATION: Laurent O, Hu J, Li L, Kleeman MJ, Bartell SM, Cockburn M, Escobedo L, Wu J. 2016. A statewide nested case-control study of preterm birth and air pollution by source and composition: California, 2001-2008. Environ Health Perspect 124:1479-1486; http://dx.doi.org/10.1289/ehp.1510133.

Indexed as

Environmental ExposureAdolescentAdultAir PollutantsAir PollutionCaliforniaCase-Control StudiesEnvironmental MonitoringFemaleGasesHumansInfant, NewbornMiddle AgedModels, TheoreticalParticle SizeParticulate MatterAir PollutantsGasesParticulate Matter

Identifiers

PMID26895492
PMCPMC5010414
OpenAlexW2346398831

What OpenQuestion holds

Textmetadata
LicenceCC0
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.