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Changes in the temperature-mortality relationship in France: Limited evidence of adaptation to a new climate

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Abstract

Context

Documenting trends in the health impacts of ambient temperature is key to supporting adaptation strategies to climate change. This paper explores changes in the temperature-related mortality in 18 French urban centers between 1970 and 2015.

Method

A multicentric time-series design with time-varying distributed lag nonlinear models was adopted to model the shape of the relationship and assess temporal changes in risks and impacts.

Results

The general shape of the temperature-mortality relationship did not change over time, except for an increasing risk at very low percentiles and a decreasing risk at very high percentiles. The relative risk at the 99.9th percentile compared to the 50th percentile of the 1970–2015 temperature distribution decreased from 2.33 [95% confidence interval (CI): 1.95:2.79] in 1975 to 1.33 [95% CI: 1.14:1.55] in 2015. Between 1970 and 2015, 302,456 [95% CI: 292,723:311,392] deaths were attributable to non-optimal temperatures, corresponding to 5.5% [95% CI: 5.3:5.6] of total mortality. This burden decreased progressively, representing 7.2% [95% CI: 6.7:7.7] of total mortality in the 1970s to 3.4% [95% CI: 3.2:3.6] in the 2000s. However, the contribution of hot temperatures to this burden (higher than the 90th percentile) increased.

Discussion

Despite the decreasing relative risk, the fraction of mortality attributable to extreme heat increased between 1970 and 2015, thus highlighting the need for proactive adaptation.

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Data Availability

The environmental data that support the findings of this study are available from Météo-France, and the mortality data from the Système National des Données de Santé, https://www.snds.gouv.fr/SNDS/Accueil, or available from the corresponding author, MP, upon reasonable request.

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Authors and Affiliations

  1. Department of Environmental and Occupational Health, Santé Publique France, 12 Rue du Val d’Osne, 94415, St Maurice, France

    Mathilde Pascal, Vérène Wagner & Magali Corso

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  1. Mathilde Pascal
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  2. Vérène Wagner
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Contributions

Conceptualization: Mathilde Pascal, Vérène Wagner; Writing – original draft preparation: Mathilde Pascal; Data curation: Magali Corso; Statistical analysis: Vérène Wagner; Writing – review & editing: Vérène Wagner, Magali Corso.

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Correspondence to Mathilde Pascal.

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Pascal, M., Wagner, V. & Corso, M. Changes in the temperature-mortality relationship in France: Limited evidence of adaptation to a new climate. Int J Biometeorol 67, 725–734 (2023). https://doi.org/10.1007/s00484-023-02451-1

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