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Long-term exposure to road traffic noise and incident myocardial infarction: A Danish Nurse Cohort study

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  • Youn-Hee Lim
  • Jeanette Jørgensen
  • Johannah Cramer
  • Heresh Amini
  • Amar Mehta
  • Laust Mortensen
  • Barbara Hoffman
  • Steffen Loft
  • Elvira Bräuner
  • Matthias Ketzel
  • Ole Hertel
  • Jørgen Brandt
  • Steen Jensen
  • Claus Backalarz
  • Thomas Cole-Hunter
  • Mette Simonsen
  • Zorana Andersen
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Background: Evidence of nonauditory health effects of road traffic noise exposure is growing. This prospective cohort study aimed to estimate the association between long-term exposure to road traffic noise above a threshold and incident myocardial infarction (MI) in Denmark.

Methods: In the Danish Nurse Cohort study, we used data of 22,378 women, at recruitment in 1993 and 1999, who reported information on MI risk factors. The participants' first hospital contact or out-of-hospital death due to MI were followed-up until 2014. We investigated a relationship between residential exposures to road traffic noise levels (L den) up to 23 years and incident MI (overall, nonfatal, and fatal) using time-varying Cox regression models adjusting for potential confounders and air pollutants. We estimated thresholds of road traffic noise (53, 56, and 58 dB) associated with incident MI in a piece-wise linear regression model.

Results: Of the 22,378 participants, 633 developed MI, 502 of which were nonfatal. We observed a non-linear relationship between the 23-year running mean of L den and incident MI with a threshold level of 56 dB, above which hazard ratios (95% confidence intervals) were 1.30 (0.97, 1.75) for overall and 1.46 (1.05, 2.03) for nonfatal MI per 10 dB. The association with nonfatal MI attenuated slightly to 1.34 (0.95, 1.90) after adjustment for fine particles.

Conclusions: We found that long-term exposure to road traffic noise above 56 dB may increase the risk of MI. The study findings suggest that road traffic noise above 56 dB may need regulation in addition to the regulation of ambient pollutants.

OriginalsprogEngelsk
Artikelnummere148
TidsskriftEnvironmental Epidemiology
Vol/bind5
Udgave nummer3
Sider (fra-til)e148
ISSN2474-7882
DOI
StatusUdgivet - jun. 2021

ID: 65784177