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How does humidity affect mortality in winter? 

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Low absolute humidity levels during the winter are associated with increased mortality, particularly related to influenza. This relationship is supported by epidemiological models and laboratory experiments . Additionally, dry and cool weather types are significantly related to increased cardiovascular-related mortality during the winter, while humid and warm weather types have the opposite effect . Cold conditions in general are associated with excess mortality in winter, primarily due to respiratory and cardiovascular diseases . The fluctuations in temperature and humidity during winter can affect the thickness of tree bark and the survival of certain organisms, such as thrips . Overall, low humidity levels and cold conditions in winter can contribute to increased mortality, particularly related to influenza and cardiovascular diseases.

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The paper states that thrips are tolerant of continuous chilling and rapid fluctuations in temperature as long as humidity is high. Warm, dry air in the bark during spring emergence is the most important cause of thrips mortality.
The paper states that low absolute humidity levels during the prior weeks are associated with increased wintertime influenza-related mortality in the United States. However, it does not specifically mention how humidity affects mortality in general during winter.
The paper states that low absolute humidity levels in the weeks prior to winter are associated with increased influenza-related mortality in the United States.
The paper states that in western cities, anomalous cardiovascular-related mortality in winter is more closely related to humidity categories. Humid weather types (HC, H, HW) are related to significantly below-average mortality, while dry weather types (DC, D, DW) are related to significantly above-average mortality.

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