Evidence map›Paper›PMID 32505016›Full record

ArticleEnvironment international2020

Associations between green space and preterm birth: Windows of susceptibility and interaction with air pollution.

Yi Sun, Paige Sheridan, Olivier Laurent, Jia Li, David A Sacks, Heidi Fischer, Yang Qiu, Yu Jiang, Ilona S Yim, Luo-Hua Jiang and 5 more

Open access · goldAbstract read
In one paragraph

Article in Environment international, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
39citing papers in PubMed, 2 pooled it
5.2field-weighted citation impact, top 3% 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

39 citing papers in PubMed, 2 syntheses or guidelines pooled it, 98 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Urban tree canopy fragmentation and child mortality in low- and middle-income countries.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. A cohort study of the multipollutant effects of PMEnvironmental epidemiology (Philadelphia, Pa.) · 2024
    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

15 authors at 8 institutions in 2 countries.

Yi SunProgram in Environmental Health Sciences, University of California, Irvine, CA 92697-3957, USA.
Paige SheridanDepartment of Family Medicine and Public Health & Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive #0725, CA La Jolla 92093, USA.
Olivier LaurentProgram in Public Health, 653 East Peltason Drive, University of California, Irvine CA 92697-3957, USA.
Jia LiProgram in Public Health, 653 East Peltason Drive, University of California, Irvine CA 92697-3957, USA.
David A SacksDepartment of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA, USA.
Heidi FischerDepartment of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA, USA.
Yang QiuDepartment of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, #24 First Ring Road South Section One, Chengdu, Sichuan, China.
Yu JiangSchool of Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Ilona S YimDepartment of Psychological Science, University of California, Irvine, CA 92697-7085, USA.
Luo-Hua JiangDepartment of Epidemiology, University of California, Irvine, CA, USA.
John MolitorCollege of Public Health and Human Sciences, Oregon State University, Corvallis, OR 97331, USA.
Jiu-Chiuan ChenDepartment of Preventive Medicine, University of Southern California, Los Angeles, CA 90033, USA.
Tarik BenmarhniaDepartment of Family Medicine and Public Health & Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive #0725, CA La Jolla 92093, USA.
Jean M LawrenceDepartment of Research & Evaluation, Kaiser Permanente Southern California, Pasadena, CA, USA.
Jun WuProgram in Environmental Health Sciences, University of California, Irvine, CA 92697-3957, USA; Program in Public Health, 653 East Peltason Drive, University of California, Irvine CA 92697-3957, USA. Electronic address: junwu@uci.edu.
University of California, Irvine · USKaiser Permanente · USScripps Institution of Oceanography · USChinese Academy of Medical Sciences & Peking Union Medical College · CNIrvine University · USOregon State University · USSichuan University · CNUniversity of Southern California · US

Funding

Environmental and Social Health Determinants of Pregnancy Outcomes Related to COVID-19 PandemicR01ES030353 · NIEHS · UNIVERSITY OF CALIFORNIA-IRVINE · PI GETAHUN, DARIOS, WU, JUN · 2019 to 2022
$3.2M
Improving the Health of Aging Women and Men.T32AG058529 · NIA · UNIVERSITY OF CALIFORNIA, SAN DIEGO · PI LACROIX, ANDREA Z. · 2019 to 2023
$1.2M
NIA NIH HHS T32 AG058529NIEHS NIH HHS R01 ES030353
6 · The paper itself

Abstract

backgroundRecent studies have reported inconsistent associations between maternal residential green space and preterm birth (PTB, born < 37 completed gestational weeks). In addition, windows of susceptibility during pregnancy have not been explored and potential interactions of green space with air pollution exposures during pregnancy are still unclear.

objectivesTo evaluate the relationships between green space and PTB, identify windows of susceptibility, and explore potential interactions between green space and air pollution.

methodsBirth certificate records for all births in California (2001-2008) were obtained. The Normalized Difference Vegetation Index (NDVI) was used to characterized green space exposure. Gestational age was treated as a time-to-event outcome; Cox proportional hazard models were applied to estimate the association between green space exposure and PTB, moderately PTB (MPTB, gestational age < 35 weeks), and very PTB (VPTB, gestational age < 30 weeks), after controlling for maternal age, race/ethnicity, education, and median household income. Month-specific green space exposure was used to identify potential windows of susceptibility. Potential interactions between green space and air pollution [fine particulate matter < 2.5 µm (PM

resultsIn total, 3,753,799 eligible births were identified, including 341,123 (9.09%) PTBs, 124,631 (3.32%) MPTBs, and 22,313 (0.59%) VPTBs. A reduced risk of PTB was associated with increases in residential NDVI exposure in 250 m, 500 m, 1000 m, and 2000 m buffers. In the 2000 m buffer, the association was strongest for VPTB [adjusted hazard ratio (HR) per interquartile range increase in NDVI: 0.959, 95% confidence interval (CI): 0.942-0.976)], followed by MPTB (HR = 0.970, 95% CI: 0.962-0.978) and overall PTB (HR = 0.972, 95% CI: 0.966-0.978). For PTB, green space during the 3rd - 5th gestational months had stronger associations than those in the other time periods, especially during the 4th gestational month (NDVI 2000 m: HR = 0.970, 95% CI: 0.965-0.975). We identified consistent positive additive and multiplicative interactions between decreasing green space and higher air pollution.

conclusionThis large study found that maternal exposure to residential green space was associated with decreased risk of PTB, MPTB, and VPTB, especially in the second trimester. There is a synergistic effect between low green space and high air pollution levels on PTB, indicating that increasing exposure to green space may be more beneficial for women with higher air pollution exposures during pregnancy.

Indexed as

Air PollutantsAir PollutionPremature BirthFemaleHumansInfant, NewbornMaternal ExposureParks, RecreationalParticulate MatterPregnancyAir PollutantsParticulate MatterAir pollutionExposure time windowGreen spaceInteractionPreterm birth

Identifiers

PMID32505016
PMCPMC7340571
OpenAlexW3032944639

What OpenQuestion holds

Textmetadata
LicenceTDM
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.