Evidence map›Paper›PMID 18714438›Full record

ArticleEpidemiology (Cambridge, Mass.)2008

The role of particle composition on the association between PM2.5 and mortality.

Meredith Franklin, Petros Koutrakis, Petros Schwartz

Abstract read
In one paragraph

Article in Epidemiology (Cambridge, Mass.), 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 142 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
142citing papers in PubMed, 4 pooled it
–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

142 citing papers in PubMed, 4 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Ozone and survival in four cohorts with potentially predisposing diseases.American journal of respiratory and critical care medicine · 2011
    Pooled it
  5. Article
  6. Review
  7. Article
  8. The effect of chronic inflammation on female fertility.Reproduction (Cambridge, England) · 2025
    Review
  9. Article
  10. Air pollution mixture complexity and its effect on PMEnvironmental epidemiology (Philadelphia, Pa.) · 2024
    Article
  11. Article
  12. Analysis of PMJournal of the Air & Waste Management Association (1995) · 2024
    Article
  13. Article
  14. Article
  15. Article
  16. Article
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  18. Article
  19. Review
  20. Article

82 more citing papers are in PubMed but not listed here.

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

3 authors.

Meredith FranklinDepartment of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, USA. mfrankli@hsph.harvard.edu
Petros Koutrakis
Petros Schwartz

Funding

Translational Research Support CoreP30ES000002 · NIEHS · HARVARD UNIVERSITY (SCH OF PUBLIC HLTH) · PI SUSAN A KORRICK · 1985 to 2026
$44.6M
NIEHS NIH HHS ES-00002NIEHS NIH HHS P30 ES000002
6 · The paper itself

Abstract

backgroundAlthough the association between exposure to particulate matter (PM) mass and mortality is well established, there remains uncertainty about which chemical components of PM are most harmful to human health.

methodsA hierarchical approach was used to determine how the association between daily PM2.5 mass and mortality was modified by PM2.5 composition in 25 US communities. First, the association between daily PM2.5 and mortality was determined for each community and season using Poisson regression. Second, we used meta-regression to examine how the pooled association was modified by community and season-specific particle composition.

resultsThere was a 0.74% (95% confidence interval = 0.41%-1.07%) increase in nonaccidental deaths associated with a 10 microg/m3 increase in 2-day averaged PM2.5 mass concentration. This association was smaller in the west (0.51% [0.10%-0.92%]) than in the east (0.92% [0.23%-1.36%]), and was highest in spring (1.88% [0.23%-1.36%]). It was increased when PM2.5 mass contained a higher proportion of aluminum (interquartile range = 0.58%), arsenic (0.55%), sulfate (0.51%), silicon (0.41%), and nickel (0.37%). The combination of aluminum, sulfate, and nickel also modified the effect. These species proportions explained residual variability between the community-specific PM2.5 mass effect estimates.

conclusionsThis study shows that certain chemical species modify the association between PM2.5 and mortality and illustrates that mass alone is not a sufficient metric when evaluating health effects of PM exposure.

Indexed as

MortalityParticle SizeAir PollutantsHumansNational Center for Health Statistics, U.S.Particulate MatterPoisson DistributionSeasonsUnited StatesUrban PopulationAir PollutantsParticulate Matter

Identifiers

PMID18714438
PMCPMC3755878

What OpenQuestion holds

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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.