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Systematic review and meta-analysis of cohort studies of long term outdoor nitrogen dioxide exposure and mortality

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Listed:
  • David M Stieb
  • Rania Berjawi
  • Monica Emode
  • Carine Zheng
  • Dina Salama
  • Robyn Hocking
  • Ninon Lyrette
  • Carlyn Matz
  • Eric Lavigne
  • Hwashin H Shin

Abstract

Objective: To determine whether long term exposure to outdoor nitrogen dioxide (NO2) is associated with all-cause or cause-specific mortality. Methods: MEDLINE, Embase, CENTRAL, Global Health and Toxline databases were searched using terms developed by a librarian. Screening, data extraction and risk of bias assessment were completed independently by two reviewers. Conflicts were resolved through consensus and/or involvement of a third reviewer. Pooling of results across studies was conducted using random effects models, heterogeneity among included studies was assessed using Cochran’s Q and I2 measures, and sources of heterogeneity were evaluated using meta-regression. Sensitivity of pooled estimates to individual studies was examined and publication bias was evaluated using Funnel plots, Begg’s and Egger’s tests, and trim and fill. Results: Seventy-nine studies based on 47 cohorts, plus one set of pooled analyses of multiple European cohorts, met inclusion criteria. There was a consistently high degree of heterogeneity. After excluding studies with probably high or high risk of bias in the confounding domain (n = 12), pooled hazard ratios (HR) indicated that long term exposure to NO2 was significantly associated with mortality from all/ natural causes (pooled HR 1.047, 95% confidence interval (CI), 1.023–1.072 per 10 ppb), cardiovascular disease (pooled HR 1.058, 95%CI 1.026–1.091), lung cancer (pooled HR 1.083, 95%CI 1.041–1.126), respiratory disease (pooled HR 1.062, 95%CI1.035–1.089), and ischemic heart disease (pooled HR 1.111, 95%CI 1.079–1.144). Pooled estimates based on multi-pollutant models were consistently smaller than those from single pollutant models and mostly non-significant. Conclusions: For all causes of death other than cerebrovascular disease, the overall quality of the evidence is moderate, and the strength of evidence is limited, while for cerebrovascular disease, overall quality is low and strength of evidence is inadequate. Important uncertainties remain, including potential confounding by co-pollutants or other concomitant exposures, and limited supporting mechanistic evidence. (PROSPERO registration number CRD42018084497)

Suggested Citation

  • David M Stieb & Rania Berjawi & Monica Emode & Carine Zheng & Dina Salama & Robyn Hocking & Ninon Lyrette & Carlyn Matz & Eric Lavigne & Hwashin H Shin, 2021. "Systematic review and meta-analysis of cohort studies of long term outdoor nitrogen dioxide exposure and mortality," PLOS ONE, Public Library of Science, vol. 16(2), pages 1-20, February.
    • Handle: RePEc:plo:pone00:0246451
    DOI: 10.1371/journal.pone.0246451
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    1. Viechtbauer, Wolfgang, 2010. "Conducting Meta-Analyses in R with the metafor Package," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 36(i03).
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