ArticleInternational archives of occupational and environmental health2025
Extreme temperatures, recent warming and seasonal influenza-linking human exposures to respiratory health in southern Germany.
Article in International archives of occupational and environmental health, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeIn the context of climate change, extreme ambient temperatures pose a major threat to human health. This study aims to provide detailed insights into how extreme temperatures and potential confounders affect respiratory morbidity.
methodsWe employed a 14-year time series analysis (2006-2019) in southern Germany, applying penalized distributed lag non-linear models to estimate exposure-response relationships between extreme temperatures and respiratory health outcomes, considering emergency outpatient treatments and hospital admissions at the emergency department of the University Hospital Augsburg. We thereby explored the roles of relative humidity and seasonal influenza as potential confounders and vulnerabilities related to age and gender.
resultsWe found significantly elevated relative risks (RRs) for the short-term cumulative effect (Lag: 0-3 days) of extreme heat and the long-term cumulative effect (Lag: 0-21 days) of extreme cold on outpatient treatments and hospital admissions. Seasonal influenza was identified as a significant confounder, with attributable fractions comparable to those of cold temperatures. A sub-period analysis (2006-2012 and 2013-2019) revealed a correlation between the recent rise in temperature and the strong increase in the estimated short-term cumulative effect of extreme heat on hospital admissions (2006-2012, RR: 1.08 (95%CI [0.91, 1.27]) vs. 2013-2019, RR: 1.32 (95%CI [1.15, 1.51]).
conclusionOur study demonstrated that extreme temperatures significantly affect respiratory morbidity, with notable influences from seasonal influenza. Sub-period analysis indicated that rising temperatures are already translating into measurable effects on respiratory health, foreshadowing the potentially devastating impacts of global warming on human health. Our results thereby provide highly relevant insights to support targeted public healthcare interventions.
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