Evidence map›Paper›PMID 21700916›Full record

SynthesisAmerican journal of respiratory and critical care medicine2011

Ozone and survival in four cohorts with potentially predisposing diseases.

Antonella Zanobetti, Joel Schwartz

Abstract readMeta-AnalysisMulticenter Study
In one paragraph

Synthesis in American journal of respiratory and critical care medicine, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
38citing papers in PubMed, 3 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

38 citing papers in PubMed, 3 syntheses or guidelines pooled it.

  1. The effect of ambient ozone exposure on three types of diabetes: a meta-analysis.Environmental health : a global access science source · 2023
    Pooled it
  2. Pooled it
  3. Pooled it
  4. Trial
  5. Long-term exposure to smoke PMEnvironment international · 2025
    Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Article
  11. Review
  12. Article
  13. Article
  14. Article
  15. Acute effects of air pollution on type II diabetes mellitus hospitalization in Shijiazhuang, China.Environmental science and pollution research international · 2018
    Article
  16. Article
  17. Review
  18. The effects of ozone on human health.Environmental science and pollution research international · 2018
    Article
  19. Article
  20. Airborne PMInternational journal of environmental research and public health · 2017
    Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

2 authors.

Antonella ZanobettiDepartment of Environmental Health, Harvard School of Public Health, Boston, MA 02215, USA. azanobet@hsph.harvard.edu
Joel 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-000002NIEHS NIH HHS P30 ES000002
6 · The paper itself

Abstract

rationaleTime series studies have reported associations between ozone and daily deaths. Only one cohort study has reported the effect of long-term exposures on deaths, and little is known about effects of chronic ozone exposure on survival in susceptible populations.

objectivesWe investigated whether ozone was associated with survival in four cohorts of persons with specific diseases in 105 United States cities, treating ozone as a time varying exposure.

methodsWe used Medicare data (1985–2006), and constructed cohorts of persons hospitalized with chronic conditions that might predispose to ozone effects: chronic obstructive pulmonary disease, diabetes, congestive heart failure, and myocardial infarction. Yearly warm-season average ozone was merged to the individual follow-up in each city. We applied Cox proportional hazard model for each cohort within each city, adjusting for individual risk factors, temperature, and city-specific long-term trends. MEASUREMENTS AND MAIN

resultsWe found significant associations with a hazard ratio for mortality of 1.06 (95% confidence interval [CI], 1.03–1.08) per 5-ppb increase in summer average ozone for persons with congestive heart failure; of 1.09 (95% CI, 1.06–1.12) with myocardial infarction; of 1.07 (95% CI, 1.04–1.09) with chronic obstructive pulmonary disease; and of 1.07 (95% CI, 1.05–1.10) for diabetics.We also found that the effect varied by region, but that this was mostly explained by mean temperature, which is likely a surrogate of air conditioning use, and hence exposure.

conclusionsThis is the first study that follows persons with specific chronic conditions, and shows that long-term ozone exposure is associated with increased risk of death in these groups.

Indexed as

AgedAir ConditioningChronic DiseaseDiabetes MellitusDisease SusceptibilityEnvironmental ExposureFemaleFollow-Up StudiesHeart DiseasesHeart FailureHumansMaleMyocardial InfarctionOzoneProportional Hazards ModelsPulmonary Disease, Chronic ObstructiveOzone

Identifiers

PMID21700916
PMCPMC3208652

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.