Ĭase-crossover analyses were used to assess the relationship between heatwaves and health outcomes using the ten HWDs. We estimated the risk shape using a non-linear (quadratic) model, to capture the well known U-shaped association between temperature and health. We regressed the average daily number of deaths and EHAs against maximum temperature rounded to whole degrees C. Heatwave definitions (HWDs) and heatwave days during 1996–2005 in Brisbane, Australia.Īs a preliminary investigation the relationships between maximum temperature and mortality and emergency hospital admissions were explored using non-linear regression. In this study, we compared heat-related health impacts using ten different definitions of heatwave in Brisbane, Australia. We are interested in the development of a heatwave definition and in whether changes in the definition are associated with appreciable changes in health outcomes. This definition is used by a heat-warning system that gives advanced warning to the public and emergency services when forecast temperatures are above the heatwave threshold. For example, in Brisbane, the local health authority changed its definition in 2006. Even at a local level there can be disagreement about what constitutes a heat wave. These differences make it impossible to develop a global definition of a heatwave. , – What would be described as a heatwave in a temperate city may not be unusual in a tropical or subtropical city. The magnitude of heatwave-related health effects depends on the intensity and duration of high temperatures, and also population acclimatisation and adaptation. – These impacts are highest during prolonged periods of unusual heat, such as the 15,000 deaths during the 2003 heatwave in France alone from the 1st to 20 th August. Heatwaves are a significant but perhaps under-estimated environmental hazard as ambient thermal conditions have a significant impact on human health. Heatwaves can result in increased deaths and emergency hospital admissions, especially among vulnerable groups such as elderly people, young children and patients with chronic diseases.
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