Projections of excess mortality related to diurnal temperature range under climate change scenarios: a multi-country modelling study

Lee, W. and Kim, Y. and Sera, F. and Gasparrini, A. and Park, R. and Michelle Choi, H. and Prifti, K. and Bell, M. L. and Abrutzky, R. and Guo, Y. and Tong, S. and de Sousa Zanotti Stagliorio Coelho, M. and Nascimento Saldiva, P. H. and Lavigne, E. and Orru, H. and Indermitte, E. and Jaakkola, J. J. K. and Ryti, N. R. I. and Pascal, M. and Goodman, P. and Zeka, A. and Hashizume, M. and Honda, Y. and Hurtado Diaz, M. and Cesar Cruz, J. and Overcenco, A. and Nunes, B. and Madureira, J. and Scovronick, N. and Acquaotta, F. and Tobias, A. and Vicedo-Cabrera, A. M. and Ragettli, M. S. and Guo, Y. L. and Chen, B. Y. and Li, S. and Armstrong, B. and Zanobetti, A. and Schwartz, J. and Kim, H.. (2020) Projections of excess mortality related to diurnal temperature range under climate change scenarios: a multi-country modelling study. Lancet Planet Health, 4 (11). e512-e521.

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BACKGROUND: Various retrospective studies have reported on the increase of mortality risk due to higher diurnal temperature range (DTR). This study projects the effect of DTR on future mortality across 445 communities in 20 countries and regions. METHODS: DTR-related mortality risk was estimated on the basis of the historical daily time-series of mortality and weather factors from Jan 1, 1985, to Dec 31, 2015, with data for 445 communities across 20 countries and regions, from the Multi-Country Multi-City Collaborative Research Network. We obtained daily projected temperature series associated with four climate change scenarios, using the four representative concentration pathways (RCPs) described by the Intergovernmental Panel on Climate Change, from the lowest to the highest emission scenarios (RCP 2.6, RCP 4.5, RCP 6.0, and RCP 8.5). Excess deaths attributable to the DTR during the current (1985-2015) and future (2020-99) periods were projected using daily DTR series under the four scenarios. Future excess deaths were calculated on the basis of assumptions that warmer long-term average temperatures affect or do not affect the DTR-related mortality risk. FINDINGS: The time-series analyses results showed that DTR was associated with excess mortality. Under the unmitigated climate change scenario (RCP 8.5), the future average DTR is projected to increase in most countries and regions (by -0.4 to 1.6 degrees C), particularly in the USA, south-central Europe, Mexico, and South Africa. The excess deaths currently attributable to DTR were estimated to be 0.2-7.4%. Furthermore, the DTR-related mortality risk increased as the long-term average temperature increased; in the linear mixed model with the assumption of an interactive effect with long-term average temperature, we estimated 0.05% additional DTR mortality risk per 1 degrees C increase in average temperature. Based on the interaction with long-term average temperature, the DTR-related excess deaths are projected to increase in all countries or regions by 1.4-10.3% in 2090-99. INTERPRETATION: This study suggests that globally, DTR-related excess mortality might increase under climate change, and this increasing pattern is likely to vary between countries and regions. Considering climatic changes, our findings could contribute to public health interventions aimed at reducing the impact of DTR on human health. FUNDING: Korea Ministry of Environment.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH)
09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Epidemiology and Public Health (EPH) > Environmental Exposures and Health Systems Research > Physical Hazards and Health (Röösli)
UniBasel Contributors:Ragettli, Martina
Item Type:Article, refereed
Article Subtype:Research Article
ISSN:2542-5196 (Electronic)2542-5196 (Linking)
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:28 Dec 2022 13:29
Deposited On:28 Dec 2022 13:29

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