Lag 1–5 year concentrations were slightly lower than lag 6–10 years due to a decreasing trend over time for most pollutants (data not shown).
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Long-term exposure to particulate matter from road traffic and residential heating and mortality: a multi-cohort study in Sweden.
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The sentences
The hazard ratios per IQR were modest and of borderline significance however, reflecting the low exposure contrasts in these low-exposure settings.