Abstract
Diurnal temperature range (DTR) is an important meteorological indicator associated with global climate change, and has been linked with mortality and morbidity in previous studies. To date, however, little evidence has been available regarding the association of DTR with years of life lost (YLL). This study aimed to evaluate the DTR-related burden on both YLL and mortality. We collected individual records of all registered deaths and daily meteorological data in Wuhan, central China, between 2009 and 2012. For the whole population, every 1 °C increase in DTR at a lag of 0–1 days was associated with an increase of 0.65% (95% CI: 0.08–1.23) and 1.42 years (−0.88–3.72) for mortality and YLL due to non-accidental deaths, respectively. Relatively stronger DTR-mortality/YLL associations were found for cardiovascular deaths. Subgroup analyses (stratified by gender, age, and education level) showed that females, the elderly (75+ years old), and those with higher education attainment (7+ years) suffered more significantly from both increased YLL and mortality due to large DTR. Our study added additional evidence that short-term exposure to large DTR was associated with increased burden of premature death using both mortality incidence and YLL.
Highlights
During the last few decades, the association of daily mortality with ambient temperature has been extensively investigated throughout the world, using time-series or case-crossover designs [1,2,3,4].According to a recent multi-country study [5], non-optimum temperatures contributed to 7.71% of daily total mortality incidence between 1985 and 2012.there is increasing evidence that an aging population could substantially enhance the heat-related mortality burden [6,7]
diurnal temperature range (DTR)-related evidence focusing on vulnerable subgroups and seasonal patterns, as well as cause-specific differences, is still relatively limited compared with available findings from cold- and heat-related studies [17]
Our preliminary analyses identified approximately linear exposure-response associations of ambient DTR with mortality and years of life lost (YLL)
Summary
During the last few decades, the association of daily mortality with ambient temperature has been extensively investigated throughout the world, using time-series or case-crossover designs [1,2,3,4].According to a recent multi-country study [5], non-optimum temperatures (i.e., cold and heat) contributed to 7.71% (95% CI: 7.43–7.91) of daily total mortality incidence between 1985 and 2012.there is increasing evidence that an aging population could substantially enhance the heat-related mortality burden [6,7]. In the context of global climate change and population aging, burden assessment from temperature extremes and other unstable weather events would be of great significance from the public health perspective [8]. As another important meteorological indicator associated with global climate change [9], diurnal temperature range (DTR) is defined as the difference between daily maximum and minimum temperature, which describes the within-day temperature variability and reflects weather stability [10,11,12]. DTR-related evidence focusing on vulnerable subgroups and seasonal patterns, as well as cause-specific differences, is still relatively limited compared with available findings from cold- and heat-related studies [17]
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