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    Responding to heatwave intensity: Excess Heat Factor is a superior predictor of health service utilisation and a trigger for heatwave plans

    Access Status
    Open access via publisher
    Authors
    Scalley, B.
    Spicer, T.
    Jian, Le
    Xiao, J.
    Nairn, J.
    Robertson, A.
    Weeramanthri, T.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Scalley, B. and Spicer, T. and Jian, L. and Xiao, J. and Nairn, J. and Robertson, A. and Weeramanthri, T. 2015. Responding to heatwave intensity: Excess Heat Factor is a superior predictor of health service utilisation and a trigger for heatwave plans. Australian and New Zealand Journal of Public Health. 39 (6): pp. 582-587.
    Source Title
    Australian and New Zealand Journal of Public Health
    DOI
    10.1111/1753-6405.12421
    ISSN
    1326-0200
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/34865
    Collection
    • Curtin Research Publications
    Abstract

    Objective: To determine which measures of heatwave have the greatest predictive power for increases in health service utilisation in Perth, Western Australia. Methods: Three heatwave formulas were compared, using Poisson or zero-inflated Poisson regression, against the number of presentations to emergency departments from all causes, and the number of inpatient admissions from heat-related causes. The period from July 2006 to June 2013 was included. A series of standardised thresholds were calculated to allow comparison between formulas, in the absence of a gold standard definition of heatwaves. Results: Of the three heatwave formulas, Excess Heat Factor (EHF) produced the most clear dose-response relationship with Emergency Department presentations. The EHF generally predicted periods that resulted in a similar or higher rate of health service utilisation, as compared to the two other formulas, for the thresholds examined. Conclusions: The EHF formula, which considers a period of acclimatisation as well as the maximum and minimum temperature, best predicted periods of greatest health service demand. The strength of the dose-response relationship reinforces the validity of the measure as a predictor of hazardous heatwave intensity. Implications: The findings suggest that the EHF formula is well suited for use as a means of activating heatwave plans and identifies the required level of response to extreme heatwave events as well as moderate heatwave events that produce excess health service demand.

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