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Effects of Coarse Particulate Matter on Emergency Hospital Admissions for Respiratory Diseases: A Time Series Analysis in Hong Kong

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  • Effects of Coarse Particulate Matter on Emergency Hospital Admissions for Respiratory Diseases: A Time Series Analysis in Hong Kong

    Environ Health Perspect. 2012 Jan 20. [Epub ahead of print]
    Effects of Coarse Particulate Matter on Emergency Hospital Admissions for Respiratory Diseases: A Time Series Analysis in Hong Kong.
    Qiu H, Yu IT, Tian L, Wang X, Tse LA, Tam W, Wong TW.
    Source

    School of Public Health and Primary Care, Chinese University of Hong Kong.
    Abstract
    BACKGROUND:

    Many epidemiologic studies have linked daily counts of hospital admissions to PM10 (particles with an aerodynamic diameter less than 10 μm) and PM2.5 (PM less than 2.5 μm) but relatively few have investigated the relationship of hospital admissions with coarse particles (PMc: PM between 2.5 and 10 μm in aerodynamic diameter).
    OBJECTIVES:

    We conducted this study to estimate the health effects of PMc on emergency hospital admissions for respiratory diseases in Hong Kong after controlling for PM2.5 and gaseous pollutants.
    METHODS:

    We conducted a time series analysis of associations between daily emergency hospital admissions for respiratory diseases in Hong Kong from January 2000 to December 2005 and daily PM2.5 and PMc concentrations. We estimated PMc concentrations by subtracting PM2.5 from PM10 measurements. We used generalized additive models (GAMs) to examine the relationship between PMc (single and multi-day lagged exposures) and hospital admissions adjusted for time trends, weather conditions, influenza outbreaks, PM2.5, and gaseous pollutants (NO2, SO2 and O3).
    RESULTS:

    A 10.9 μg/m3 (interquartile range) increase in the 4-day moving average concentration of PMc was associated with a 1.94% (95% CI: 1.24%, 2.64%) increase in emergency hospital admissions for respiratory diseases that was attenuated but still significant after controlling for PM2.5. Adjusting for gaseous pollutants and altering models assumptions had little influence on PMc effect estimates.
    CONCLUSION:

    PMc was associated with emergency hospital admissions for respiratory diseases in Hong Kong independent of PM2.5 and gaseous pollutants. Further research is needed to evaluate health effects of different components of PMc.

    PMID:
    22266709
    [PubMed - as supplied by publisher]

    PMc was associated with emergency hospital admissions for respiratory diseases in Hong Kong independent of PM2.5 and gaseous pollutants. Further research is needed to evaluate health effects of different components of PMc.
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