Yasushi Honda
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View article: Nationwide high-resolution heat risk projections and intervention cost analysis for the elderly in Japan under climate and demographic changes
Nationwide high-resolution heat risk projections and intervention cost analysis for the elderly in Japan under climate and demographic changes Open
Global warming and population aging are amplifying heat-related health risks in Japan. The country records approximately 1000 heatstroke deaths annually, over 80 % of which involve elderly people. This study aimed to project future elderly…
View article: Future heatstroke mortality in Japan: Impacts of climate, demographic changes, and long-term heat adaptation
Future heatstroke mortality in Japan: Impacts of climate, demographic changes, and long-term heat adaptation Open
The International Classification of Diseases (ICD)-10: X30, an indicator that reflects the direct health impacts of excessive natural heat, has rarely been applied in Japan. This study projects heatstroke mortality for all 47 prefectures i…
View article: Short-term association between hot nights and mortality: a multicountry analysis in 178 locations considering hourly ambient temperature
Short-term association between hot nights and mortality: a multicountry analysis in 178 locations considering hourly ambient temperature Open
View article: Projected compound effects of population aging and climate warming on emergency ambulance demand in Japan
Projected compound effects of population aging and climate warming on emergency ambulance demand in Japan Open
Demand for emergency medical services among older adults is expected to rise, especially until mid-century, with high demand in both summer and winter. Adaptive strategies are needed to manage increasing emergency service demands and shift…
View article: Analysis of important meteorological indicators of heatstroke mortality in Japan
Analysis of important meteorological indicators of heatstroke mortality in Japan Open
Background and Aim: Heatstroke has become a serious issue in Japan. To reduce the risk of heatstroke, the Japanese government has implemented initiatives such as the “Heatstroke Alert”, which is issued when the wet bulb globe temperature (…
View article: Economic burden of ambulance transports for patients with heatstroke under climate change: comparison of the effects of gradual temperature increases and extreme heat events
Economic burden of ambulance transports for patients with heatstroke under climate change: comparison of the effects of gradual temperature increases and extreme heat events Open
Although the risk of heatstroke is already severe in Japan, it is expected to increase due to climate change. Researchers have mainly focused on future increases in heatstroke morbidity and mortality to project the risk of heatstroke in Ja…
View article: In-hospital mortality of heat-related disease associated with wet bulb globe temperature: a Japanese nationwide inpatient data analysis
In-hospital mortality of heat-related disease associated with wet bulb globe temperature: a Japanese nationwide inpatient data analysis Open
View article: Heat impacts on school sports club activities in Japan under climate change and the effectiveness of countermeasures
Heat impacts on school sports club activities in Japan under climate change and the effectiveness of countermeasures Open
Millions of students in Japan participate in school sports club activities, where thousands of heat illness cases occur every year. With future climate change, there is concern about the increased health risks posed to students in sports c…
View article: Impact of the urban heat island on heat-related mortality in the Tokyo Metropolitan Area, Japan
Impact of the urban heat island on heat-related mortality in the Tokyo Metropolitan Area, Japan Open
With global temperatures rising, urban heat islands (UHIs) intensify heat exposure in cities, potentially elevating heat-related mortality. However, the specific burden of UHI-attributable mortality remains inadequately quantified. This st…
View article: Meteorological factors, population immunity, and COVID-19 incidence: A global multi-city analysis
Meteorological factors, population immunity, and COVID-19 incidence: A global multi-city analysis Open
Objectives: While COVID-19 continues to challenge the world, meteorological variables are thought to impact COVID-19 transmission. Previous studies showed evidence of negative associations between high temperature and absolute humidity on …
View article: Proposing adjustments to heat safety thresholds for junior high and high school sports clubs in Japan
Proposing adjustments to heat safety thresholds for junior high and high school sports clubs in Japan Open
With higher temperatures expected in the future due to global climate change, addressing health risks such as heat illness is increasingly important. In Japan, thousands of heat illness cases occur annually during school sports club activi…
View article: Association of holidays and the day of the week with suicide risk: multicountry, two stage, time series study
Association of holidays and the day of the week with suicide risk: multicountry, two stage, time series study Open
Objectives To assess the short term temporal variations in suicide risk related to the day of the week and national holidays in multiple countries. Design Multicountry, two stage, time series design. Setting Data from 740 locations in 26 c…
View article: Rainfall events and daily mortality across 645 global locations: two stage time series analysis
Rainfall events and daily mortality across 645 global locations: two stage time series analysis Open
Objective To examine the associations between characteristics of daily rainfall (intensity, duration, and frequency) and all cause, cardiovascular, and respiratory mortality. Design Two stage time series analysis. Setting 645 locations acr…
View article: Non-optimal temperature-attributable mortality and morbidity burden by cause, age and sex under climate and population change scenarios: a nationwide modelling study in Japan
Non-optimal temperature-attributable mortality and morbidity burden by cause, age and sex under climate and population change scenarios: a nationwide modelling study in Japan Open
View article: Temporal change in minimum mortality temperature under changing climate: A multicountry multicommunity observational study spanning 1986–2015
Temporal change in minimum mortality temperature under changing climate: A multicountry multicommunity observational study spanning 1986–2015 Open
Background: The minimum mortality temperature (MMT) or MMT percentile (MMTP) is an indicator of population susceptibility to nonoptimum temperatures. MMT and MMTP change over time; however, the changing directions show region-wide heteroge…
View article: Random forest analysis of the relative importance of meteorological indicators for heatstroke cases in Japan based on the degree of severity and place of occurrence
Random forest analysis of the relative importance of meteorological indicators for heatstroke cases in Japan based on the degree of severity and place of occurrence Open
Heatstroke is a serious health concern in Japan. To reduce heatstroke risk, the government of Japan implemented the "Heatstroke Alert" nationwide in 2021, employing the wet bulb globe temperature (WBGT) as a criterion. Although the WBGT is…
View article: Heat impacts on school sports club activities in Japan under climate change and the effectiveness of countermeasures
Heat impacts on school sports club activities in Japan under climate change and the effectiveness of countermeasures Open
Millions of students in Japan participate in school sports club activities, where thousands of heat illness cases occur every year. With future climate change, there is concern about the increased health risks posed to students in sports c…
View article: Temperature-mortality associations by age and cause: a multi-country multi-city study
Temperature-mortality associations by age and cause: a multi-country multi-city study Open
Background: Heterogeneity in temperature-mortality relationships across locations may partly result from differences in the demographic structure of populations and their cause-specific vulnerabilities. Here we conduct the largest epidemio…
View article: Proposing adjustments to heat safety thresholds for junior high and high school sports clubs in Japan
Proposing adjustments to heat safety thresholds for junior high and high school sports clubs in Japan Open
With higher temperatures expected in the future due to global climate change, addressing health risks such as heat illness is increasingly important. In Japan, thousands of heat illness cases occur annually during school sports club activi…
View article: Temporal change and spatial heterogeneity of the association between ambient temperature and transport accident mortality in Japan from 1972 to 2019: a nationwide time-stratified case-crossover study
Temporal change and spatial heterogeneity of the association between ambient temperature and transport accident mortality in Japan from 1972 to 2019: a nationwide time-stratified case-crossover study Open
Studies have demonstrated that ambient temperature was associated with transport accidents; however, little is known about the temporal change and spatial heterogeneity of this association. This study investigated the temporal change and s…
View article: Short-term association between hot nights and mortality: a multicountry analysis in 178 locations. 
Short-term association between hot nights and mortality: a multicountry analysis in 178 locations.  Open
The increase in hot nights in the last decades and the projected increase due to climate change makes increasing knowledge about their impact important and critical for measures of public health actions and adaptation planning. However, fe…
View article: All-cause, cardiovascular, and respiratory mortality and wildfire-related ozone: a multicountry two-stage time series analysis
All-cause, cardiovascular, and respiratory mortality and wildfire-related ozone: a multicountry two-stage time series analysis Open
View article: Extreme Temperatures and Stroke Mortality: Evidence From a Multi-Country Analysis
Extreme Temperatures and Stroke Mortality: Evidence From a Multi-Country Analysis Open
BACKGROUND: Extreme temperatures contribute significantly to global mortality. While previous studies on temperature and stroke-specific outcomes presented conflicting results, these studies were predominantly limited to single-city or sin…
View article: Comparison for the effects of different components of temperature variability on mortality: A multi-country time-series study
Comparison for the effects of different components of temperature variability on mortality: A multi-country time-series study Open
View article: Temperature frequency and mortality: Assessing adaptation to local temperature
Temperature frequency and mortality: Assessing adaptation to local temperature Open
View article: Impact of population aging on future temperature-related mortality at different global warming levels
Impact of population aging on future temperature-related mortality at different global warming levels Open
View article: Heat-related mortality and ambulance transport after a power outage in the Tokyo metropolitan area
Heat-related mortality and ambulance transport after a power outage in the Tokyo metropolitan area Open
Background: Air conditioners can prevent heat-related illness and mortality, but the increased use of air conditioners may enhance susceptibility to heat-related illnesses during large-scale power failures. Here, we examined the risks of h…
View article: Seasonality of mortality under climate change: a multicountry projection study
Seasonality of mortality under climate change: a multicountry projection study Open
View article: Global, regional, and national burden of mortality associated with cold spells during 2000–19: a three-stage modelling study
Global, regional, and national burden of mortality associated with cold spells during 2000–19: a three-stage modelling study Open
View article: Proposing the flexible application of heat safety thresholds for junior high and high school sports clubs in Japan
Proposing the flexible application of heat safety thresholds for junior high and high school sports clubs in Japan Open
Objectives To verify the appropriateness of applying uniform heat safety thresholds (HSTs) in sports club activities at Japanese junior high and high schools, and to propose the flexible application of HSTs according to the conditions of t…