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  • Title: Long-term exposure to fine particulate matter and incidence of type 2 diabetes mellitus in a cohort study: effects of total and traffic-specific air pollution.
    Author: Weinmayr G, Hennig F, Fuks K, Nonnemacher M, Jakobs H, Möhlenkamp S, Erbel R, Jöckel KH, Hoffmann B, Moebus S, Heinz Nixdorf Recall Investigator Group.
    Journal: Environ Health; 2015 Jun 19; 14():53. PubMed ID: 26087770.
    Abstract:
    BACKGROUND: Studies investigating the link between long-term exposure to air pollution and incidence of diabetes are still scarce and results are inconsistent, possibly due to different compositions of the particle mixture. We investigate the long-term effect of traffic-specific and total particulate matter (PM) and road proximity on cumulative incidence of diabetes mellitus (mainly type 2) in a large German cohort. METHODS: We followed prospectively 3607 individuals without diabetes at baseline (2000-2003) from the Heinz Nixdorf Recall Study in Germany (mean follow-up time 5.1 years). Mean annual exposures to total as well as traffic-specific PM10 and PM2.5 at residence were estimated using a chemistry transport model (EURAD, 1 km(2) resolution). Effect estimates for an increase of 1 μg/m(3) in PM were obtained with Poisson regression adjusting for sex, age, body mass index, lifestyle factors, area-level and individual-level socio-economic status, and city. RESULTS: 331 incident cases developed. Adjusted RRs for total PM10 and PM2.5 were 1.05 (95%-CI: 1.00;1.10) and 1.03 (95%-CI: 0.95;1.12), respectively. Markedly higher point estimates were found for local traffic-specific PM with RRs of 1.36 (95%-CI: 0.98;1.89) for PM10 and 1.36 (95%-CI: 0.97;1.89) for PM2.5. Individuals living closer than 100 m to a busy road had a more than 30% higher risk (1.37;95%-CI: 1.04;1.81) than those living further than 200 m away. CONCLUSIONS: Long-term exposure to total PM increases type two diabetes risk in the general population, as does living close to a major road. Local traffic-specific PM was related to higher risks for type two diabetes than total PM.
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