Impact of summer heat on mortality and years of life lost: Application of a novel indicator of daily excess hourly heat

Jiao, Anqi; Yu, Chuanhua; Xiang, Qianqian; Zhang, Faxue; Chen, Dieyi; Zhang, Lan; Hu, Kejia; Zhang, Ling; Zhang, Yunquan

doi:10.1016/j.envres.2019.01.056

Cited by 18 publications

(18 citation statements)

References 61 publications

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“…Temperature mea sures used in cli ma tehealth an a ly ses in lowin come countries relyonarel a tivelycoarsespa tialscale(usu ally25-50ki lo me ters)andei therafine (dailymax i mumval ues,forex am ple)orcoarse(monthlyoryearlyav er ages)tem po ral scale. There are sev eral ap proaches used to ag gre gate tem per a ture data with health orotherpop u la tionda ta.Amongthecom monap proachesarecal cu lat ingan nu al,sea son al,ormonthlymeansofdailymax i mumval ues,orde riv ingheatwavein di ca tors, which of ten iden tify se quences of days when the daily max i mum ex ceeds a spe cificthresh oldorper cen tileofthetem per a turedis tri bu tionforagivenlo ca tion(see Phalkey et al 2015;Zhang et al 2017).Whereavail able,hourlymea suresoftem per a ture data can pro vide ad di tional con text (Jiao et al 2019),forex am ple,byex am in ing the im pact of ex ces sive night time or morn ing tem per a ture on health out comes.…”

Section: Heat Stressmentioning

confidence: 99%

Exploring Strategies for Investigating the Mechanisms Linking Climate and Individual-Level Child Health Outcomes: An Analysis of Birth Weight in Mali

et al. 2021

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The goal of this article is to consider data solutions to investigate the differential pathways that connect climate/weather variability to child health outcomes. We apply several measures capturing different aspects of climate/weather variability to different time periods of in utero exposure. The measures are designed to capture the complexities of climate-related risks and isolate their impacts based on the timing and duration of exposure. Specifically, we focus on infant birth weight in Mali and consider local weather and environmental conditions associated with the three most frequently posited potential drivers of adverse health outcomes: disease (malaria), heat stress, and food insecurity. We focus this study on Mali, where seasonal trends facilitate the use of measures specifically designed to capture distinct aspects of climate/weather conditions relevant to the potential drivers. Results indicate that attention to the timing of exposures and employing measures designed to capture nuances in each of the drivers provides important insight into climate and birth weight outcomes, especially in the case of factors impacted by precipitation. Results also indicate that high temperatures and low levels of agricultural production are consistently associated with lower birth weights, and exposure to malarious conditions may increase likelihood of nonlive birth outcomes.

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Section: Heat Stressmentioning

confidence: 99%

Exploring Strategies for Investigating the Mechanisms Linking Climate and Individual-Level Child Health Outcomes: An Analysis of Birth Weight in Mali

et al. 2021

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“…We used a novel index-DEHH (daily excess hourly heat) in this study. DEHH is a cumulative temperature variable generated by adding the temperature values that exceed the speci c heat threshold per hour within a day (Jiao et al 2019;Lin et al 2019). The calculation formula is as follows:…”

Section: De Nition and Calculation Of Hourly Excess Heat Exposure Within A Daymentioning

confidence: 99%

“…However, daily mean temperature cannot consider hourly temperature change, which is also a potential risk factor for health (Hu et al 2019). Some heat-related assessments usually focus on days when the daily mean temperature is above the temperature threshold, which may not examine the practical effects of heat on disease, as hourly extreme high temperatures of these days can also have an adverse effect (Jiao et al 2019). Thus, many studies suggested that the usage of hourly temperature data to assess the risk of morbidity and mortality is necessary (Lin et al 2019 (Lin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Thereafter, some studies revealed that monthly or daily high temperature can increase hospitalizations for schizophrenia (Clarke et al 1999;Shiloh et al 2005;Aviv et al 2011;Wang et al 2014;Pan et al 2019;Zhang et al 2020). Besides, increasing studies have raised that ner scale temperature exposure measurements can better capture the health impact of heat (Jiao et al 2019;Guo. 2016; Hu et al 2019), but it remained unknown regarding the temperature-schizophrenia relationship at a ner scale beyond daily scale.…”

Section: Introductionmentioning

confidence: 99%

“…Most of previous studies on the relationship between temperature and schizophrenia hospitalizations used daily mean temperature as exposure indicator (Sung et al 2011;Wang et al 2018;Pan et al 2019), which may underestimate the impact of high temperature on schizophrenia. Therefore, it is necessary to apply a novel index -daily excess hourly heat (DEHH, similar to △DH HOT ) (Lin et al 2019;Jiao et al 2019) to make full use of the information of hourly temperature to explore the precise effect of accumulated high temperature within a day on hospitalization for schizophrenia.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Accumulated And Transient Heat Exposure On Schizophrenia Hospitalizations: A Time-Series Analysis On Hourly Temperature Basis

Tang

et al. 2021

Preprint

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Background: Growing studies have shown that high temperature is a potential risk factor of schizophrenia occurrence. Therefore, elaborate analysis of different temperature exposure patterns such as cumulative heat exposure within a time period and transient exposure at a particular time point, is of important public health significance. This study aims to utilize hourly temperature data to better capture the effects of cumulative and transient heat exposures on schizophrenia during the warm season in Hefei, China. Methods: We included the daily mean temperature and daily schizophrenia hospitalizations into the distributed lag non-linear model (DLNM) to simulate the exposure-response curve and determine the heat threshold (19.4℃). We calculated and applied a novel indictor–daily excess heat hourly (DEHH) to examine the effects of cumulative heat exposure over a day on schizophrenia hospitalizations. Temperature measurements at each time point were also incorporated in the DLNM as independent exposure indicators to analyze the impact of transient heat exposure on schizophrenia. Results: Each increment of interquartile range (IQR) in DEHH was associated with elevated risk of schizophrenia hospitalizations from lag 1 (RR=1.036, 95% confidence interval (CI): 1.016, 1.057) to lag 4 (RR=1.025, 95% CI: 1.005, 1.046). Men and people over 40 years old were more susceptible to DEHH. Besides, we found a greater risk of heat-related schizophrenia hospitalizations between 0 am and 6 am.Conclusions: This study revealed the negative effects of accumulated and transient heat exposures on schizophrenia hospitalizations. Our findings need to be further tested in other regions with distinct regional features.

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Analysis of Heat Exposure During Pregnancy and Severe Maternal Morbidity

Jiao,

Sun,

Avila

et al. 2023

JAMA Netw Open

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ImportanceThe rate of severe maternal morbidity (SMM) is continuously increasing in the US. Evidence regarding the associations of climate-related exposure, such as environmental heat, with SMM is lacking.ObjectiveTo examine associations between long- and short-term maternal heat exposure and SMM.Design, Setting, and ParticipantsThis retrospective population-based epidemiological cohort study took place at a large integrated health care organization, Kaiser Permanente Southern California, between January 1, 2008, and December 31, 2018. Data were analyzed from February to April 2023. Singleton pregnancies with data on SMM diagnosis status were included.ExposuresModerate, high, and extreme heat days, defined as daily maximum temperatures exceeding the 75th, 90th, and 95th percentiles of the time series data from May through September 2007 to 2018 in Southern California, respectively. Long-term exposures were measured by the proportions of different heat days during pregnancy and by trimester. Short-term exposures were represented by binary variables of heatwaves with 9 different definitions (combining percentile thresholds with 3 durations; ie, ≥2, ≥3, and ≥4 consecutive days) during the last gestational week.Main Outcomes and MeasuresThe primary outcome was SMM during delivery hospitalization, measured by 20 subconditions excluding blood transfusion. Discrete-time logistic regression was used to estimate associations with long- and short-term heat exposure. Effect modification by maternal characteristics and green space exposure was examined using interaction terms.ResultsThere were 3446 SMM cases (0.9%) among 403 602 pregnancies (mean [SD] age, 30.3 [5.7] years). Significant associations were observed with long-term heat exposure during pregnancy and during the third trimester. High exposure (≥80th percentile of the proportions) to extreme heat days during pregnancy and during the third trimester were associated with a 27% (95% CI, 17%-37%; P &lt; .001) and 28% (95% CI, 17%-41%; P &lt; .001) increase in risk of SMM, respectively. Elevated SMM risks were significantly associated with short-term heatwave exposure under all heatwave definitions. The magnitude of associations generally increased from the least severe (HWD1: daily maximum temperature &gt;75th percentile lasting for ≥2 days; odds ratio [OR], 1.32; 95% CI, 1.17-1.48; P &lt; .001) to the most severe heatwave exposure (HWD9: daily maximum temperature &gt;95th percentile lasting for ≥4 days; OR, 2.39; 95% CI, 1.62-3.54; P &lt; .001). Greater associations were observed among mothers with lower educational attainment (OR for high exposure to extreme heat days during pregnancy, 1.43; 95% CI, 1.26-1.63; P &lt; .001) or whose pregnancies started in the cold season (November through April; OR, 1.37; 95% CI, 1.24-1.53; P &lt; .001).Conclusions and RelevanceIn this retrospective cohort study, long- and short-term heat exposure during pregnancy was associated with higher risk of SMM. These results might have important implications for SMM prevention, particularly in a changing climate.

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Impact of summer heat on mortality and years of life lost: Application of a novel indicator of daily excess hourly heat

Cited by 18 publications

References 61 publications

Exploring Strategies for Investigating the Mechanisms Linking Climate and Individual-Level Child Health Outcomes: An Analysis of Birth Weight in Mali

Exploring Strategies for Investigating the Mechanisms Linking Climate and Individual-Level Child Health Outcomes: An Analysis of Birth Weight in Mali

Effects of Accumulated And Transient Heat Exposure On Schizophrenia Hospitalizations: A Time-Series Analysis On Hourly Temperature Basis

Analysis of Heat Exposure During Pregnancy and Severe Maternal Morbidity

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