Association between ambient temperature and heat waves with mortality in South Asia: Systematic review and meta-analysis

Dimitrova, Asya; Ingole, Vijendra; Basagaña, Xavier; Ranzani, Otávio T.; Milà, Carles; Ballester, Joan; Tonne, Cathryn

doi:10.1016/j.envint.2020.106170

Cited by 74 publications

(42 citation statements)

References 103 publications

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“…Recently, studies on projections in climate extremes over SA are less compared to the rest of the globe, limited with the Paris Agreement targets (Aadhar & Mishra, 2019;Iyakaremye, Zeng, Siebert, & Yang, 2021;Iyakaremye, Zeng, Ullah, et al, 2021;Khan et al, 2019;Liu et al, 2017;Rohini et al, 2019) and higher global warming targets (Im et al, 2017;Mazdiyasni et al, 2017;Mishra et al, 2017). The results further support the findings of Im et al (2017), Rohini et al (2019), andDimitrova et al (2021), who anticipated fewer HW events over the Indian Himalayan with an increase of 28-33°C, while a significant increase in HWs events are projected in southern India and western SA under RCP4.5 and RCP8.5 scenarios.…”

Section: Discussionsupporting

confidence: 65%

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Projected Changes in Socioeconomic Exposure to Heatwaves in South Asia Under Changing Climate

et al. 2022

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The risk of population exposure to severe heatwaves (HWs) increases in a hot and humid environment (Im et al., 2017). The wet-bub temperature (T WB ) takes into account temperature and humidity to measure the human body's surveillance limits. Population exposure to T WB exceeding a threshold of 35°C for a few hours of a day would result in death; therefore, 35°C can be used as an upper limit on human surveillance in a natural

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Section: Discussionsupporting

confidence: 65%

“…(2019), and Dimitrova et al. (2021), who anticipated fewer HW events over the Indian Himalayan with an increase of 28–33°C, while a significant increase in HWs events are projected in southern India and western SA under RCP4.5 and RCP8.5 scenarios.…”

Section: Discussionmentioning

confidence: 96%

Projected Changes in Socioeconomic Exposure to Heatwaves in South Asia Under Changing Climate

et al. 2022

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“…Extreme temperature events become increasingly frequent. Many studies have provided evidence that extreme temperatures are associated with short-term increases in daily mortality (Adab et al 2021;Chen et al 2014;Curtis et al 2017). Our study adds evidence that extreme temperatures also have an impact on YLL.…”

Section: Discussionsupporting

confidence: 69%

“…Ambient temperature is regarded as an important risk factor for public health (Gasparrini et al 2015 ; Son et al 2019 ). Recently, the majority of epidemiological studies have demonstrated association between non-optimum ambient temperature exposure and mortality or morbidity of CVDs (Achebak et al 2019 ; Dimitrova et al 2021 ; Huber et al 2020 ; Martínez-Solanas and Basagaña 2019 ). The findings indicated that high or low temperatures could increase the risks of mortality or morbidity.…”

Section: Introductionmentioning

confidence: 99%

Impact of ambient temperature on life loss per death from cardiovascular diseases: a multicenter study in central China

Zhou

Jin

et al. 2021

Environ Sci Pollut Res

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Background In the context of global climate change, studies have focused on the ambient temperature and mortality of cardiovascular diseases (CVDs). However, little is known about the effect of ambient temperature on year of life lost (YLL), especially the life loss per death caused by ambient temperature. In this study, we aimed to assess the relationship between ambient temperature and life loss and estimate the impact of ambient temperature on life loss per death. Methods We collected daily time series of mortality and meteorological data from 70 locations in Hunan province, central China, in periods ranging from Jan. 1, 2013, to Dec. 31, 2017. Crude rates of YLL were calculated per 100,000 people per year (YLL/100,000 population) for each location. A distributed lag nonlinear model and multivariate meta-regression were used to estimate the associations between ambient temperature and YLL rates. Then, the average life loss per death attributable to ambient temperature was calculated. Results There were 711,484 CVD deaths recorded within the study period. The exposure-response curve between ambient temperature and YLL rates was inverted J or U-shaped. Relative to the minimum YLL rate temperature, the life loss risk of extreme cold temperature lasted for 10 to 12 days, whereas the risk of extreme hot temperature appeared immediately and lasted for 3 days. On average, the life loss per death attributable to non-optimum ambient temperatures was 1.89 (95% CI, 1.21-2.56) years. Life loss was mainly caused by cold temperature (1.13, 95% CI, 0.89‑1.37), particularly moderate cold (1.00, 95% CI, 0.78‑1.23). For demographic characteristics, the mean life loss per death was relatively higher for males (2.07, 95% CI, 1.44‑2.68) and younger populations (3.72, 95% CI, 2.06‑5.46) than for females (1.88, 95% CI, 1.21-2.57) and elderly people (1.69, 95% CI, 1.28-2.10), respectively. Conclusions We found that both cold and hot temperatures significantly aggravated premature death from CVDs. Our results indicated that the whole range of effects of ambient temperature on CVDs should be given attention.

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“…Therefore, we changed the degree of freedom of natural spline function of meteorological factors and air pollution in the model from 3 to 5 successively in order to control their confounding influence. The degree of freedom of the temporal natural spline function in the model is changed from 6 to 8 successively in order to control the trend of time [ 8 , 34 ]. In the dimension of expose-response maintenance and expose-lag, the location and number of knots fitted by absolute humidity and lag parameters are changed by changing degree of freedom [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

The role of absolute humidity in respiratory mortality in Guangzhou, a hot and wet city of South China

Chen

Liu

Lin

et al. 2021

Environ Health Prev Med

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Background For the reason that many studies have been inconclusive on the effect of humidity on respiratory disease, we examined the association between absolute humidity and respiratory disease mortality and quantified the mortality burden due to non-optimal absolute humidity in Guangzhou, China. Methods Daily respiratory disease mortality including total 42,440 deaths from 1 February 2013 to 31 December 2018 and meteorological data of the same period in Guangzhou City were collected. The distributed lag non-linear model was used to determine the optimal absolute humidity of death and discuss their non-linear lagged effects. Attributable fraction and population attributable mortality were calculated based on the optimal absolute humidity, defined as the minimum mortality absolute humidity. Results The association between absolute humidity and total respiratory disease mortality showed an M-shaped non-linear curve. In total, 21.57% (95% CI 14.20 ~ 27.75%) of respiratory disease mortality (9154 deaths) was attributable to non-optimum absolute humidity. The attributable fractions due to high absolute humidity were 13.49% (95% CI 9.56 ~ 16.98%), while mortality burden of low absolute humidity were 8.08% (95% CI 0.89 ~ 13.93%), respectively. Extreme dry and moist absolute humidity accounted for total respiratory disease mortality fraction of 0.87% (95% CI − 0.09 ~ 1.58%) and 0.91% (95% CI 0.25 ~ 1.39%), respectively. There was no significant gender and age difference in the burden of attributable risk due to absolute humidity. Conclusions Our study showed that both high and low absolute humidity are responsible for considerable respiratory disease mortality burden, the component attributed to the high absolute humidity effect is greater. Our results may have important implications for the development of public health measures to reduce respiratory disease mortality.

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Association between ambient temperature and heat waves with mortality in South Asia: Systematic review and meta-analysis

Cited by 74 publications

References 103 publications

Projected Changes in Socioeconomic Exposure to Heatwaves in South Asia Under Changing Climate

Projected Changes in Socioeconomic Exposure to Heatwaves in South Asia Under Changing Climate

Impact of ambient temperature on life loss per death from cardiovascular diseases: a multicenter study in central China

The role of absolute humidity in respiratory mortality in Guangzhou, a hot and wet city of South China

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