Ambient temperature, sunlight duration, and suicide: A systematic review and meta-analysis

Gao, Jiaojiao; Cheng, Qiang; Duan, Jun; Xu, Zihan; Bai, Lianhua; Zhang, Yanwu; Zhang, Heng; Wang, Shusi; Zhang, Zhihua; Su, Hong

doi:10.1016/j.scitotenv.2018.07.098

Cited by 104 publications

(68 citation statements)

References 57 publications

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“…Multiple conditions have been associated with suicide, including mental health disorders, physical disability, significant life events, and socio-cultural stressors such as financial stress, economic crisis, violence, and discrimination, as well as changes in environmental conditions [5]—primarily temperature [6]. More broadly, air pollution is one of the most important risk factors related to adverse effects for human health.…”

Section: Introductionmentioning

confidence: 99%

Air Pollution and Suicide in Mexico City: A Time Series Analysis, 2000–2016

Astudillo‐García

Rodríguez-Villamizar

Cortez‐Lugo

et al. 2019

IJERPH

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The association between air pollution and suicide has recently been under examination, and the findings continue to be contradictory. In order to contribute evidence to this still unresolved question, the objective of the present study was to evaluate the association between air quality and daily suicides registered in Mexico City (MC) between 2000 and 2016. Air quality was measured based on exposure to particulate matter under 2.5 and 10 micrometers (µm) (PM2.5 and PM10, respectively), ozone (O3), nitrogen dioxide (NO2), and sulfur dioxide (SO2), adjusting for weather variables (air temperature and relative humidity), and holidays. To this end, an ecologic time series analysis was performed using a Poisson regression model conditioned by time and stratified by gender and age groups. Models were also generated to explore the lagged and accumulative effects of air pollutants, adjusted by weather variables. The effects of the pollutants were very close to the null value in the majority of the models, and no accumulative effects were identified. We believe these results, in this case, no evidence of a statistical association, contribute to the current debate about whether the association between air pollution and suicide reported in the scientific literature reflects an actual effect or an uncontrolled confounding effect.

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Section: Introductionmentioning

confidence: 99%

Air Pollution and Suicide in Mexico City: A Time Series Analysis, 2000–2016

Astudillo‐García

Rodríguez-Villamizar

Cortez‐Lugo

et al. 2019

IJERPH

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“…Seasonally-uctuating factors that could regulate these temporal patterns are temperature and sunlight. Warm temperatures attenuate risk for circulatory system-related morbidity and mortality [28,[43][44][45][46][47][48][49][50][51][52] and warm temperatures, especially abnormally warm temperatures during cool months, increase risk, including short-term risk, for suicide [36,37,[53][54][55][56][57][58][59][60][61][62][63][64][65]. Sunlight similarly moderates circulatory disease-related morbidity and mortality [29,44,[66][67][68] and suicide risk [53,[69][70][71][72][73][74][75] and may contribute to the temporal cross-correlations we detected.…”

Section: Discussionmentioning

confidence: 99%

Temporal patterns of suicide and circulatory system disease-related mortality are inversely correlated in several countries

Kaufman

Fitzmaurice

2020

Preprint

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Background Nearly 800,000 suicides occur worldwide annually and suicide rates are increasing faster than population growth. Unfortunately, the pathophysiology of suicide remains poorly understood, which has hindered suicide prevention efforts. However, mechanistic clues may be found by studying effects of seasonality on suicide and other mortality causes. Suicides tend to peak in spring-summer periods and nadir in fall-winter periods while circulatory system disease-related mortality tends to exhibit the opposite temporal trends. This study aimed to determine for the first time whether monthly temporal cross-correlations exist between suicide and circulatory system disease-related mortality at the population level. If so and if common biological factors moderate risks for both mortality types, such factors may be discoverable and utilized to improve suicide prevention.Methods We conducted time series analyses of monthly mortality data from northern (England and Wales, South Korea, United States) and southern (Australia, Brazil) hemisphere countries during the period 2009-2018 (N=41.8 million all-cause mortality cases). We used a Poisson regression variant of the standard cosinor model to determine cross-correlations between monthly mortality rates from suicide and from circulatory system diseases.Results Suicide and circulatory disease-related mortality temporal patterns were negatively correlated in Australia (-0.32), Brazil (-0.57), South Korea (-0.32), and in the United States (-0.66), but no temporal correlation was discernable in England and Wales.Conclusions The negative temporal cross-correlations between these mortality types we found in 4 of 5 countries studied suggest that seasonal factors broadly and inversely moderate risks for circulatory disease-related mortality and suicide. Since the seasonal factors of temperature and light exert opposite effects on suicide and circulatory disease-related mortality in several countries, we propose that physiologically-adaptive circulatory system responses to heat and light may increase risk for suicide and should be studied to determine whether they affect suicide risk. For example, heat and light increase production and release of the bioactive gas nitric oxide and reduce circulatory system disease by relaxing blood vessel tone, while elevated nitric oxide levels are associated with suicidal behavior, inverse effects that parallel the inverse temporal mortality patterns we detected.

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“…En contraposición a esa hipótesis, los resultados de la presente investigación que capturan el comportamiento por mes en un total de 20 años, muestran que mientras condiciones depresivas pueden presentarse en los meses de invierno, como da cuenta la convergencia entre los términos suicidio y tristeza, la acción o concreción de las ideas suicidas de hecho ocurre en los meses de mayo y junio. Al respecto el manuscrito documenta que el score máximo para el término de búsqueda 'suicidio' en Aguascalientes ocurre regularmente en los meses de mayo y junio, meses que también registran la mayor incidencia de suicidio para el estado, resultado que es consistente con los patrones detectados por estudios recientes en el contexto de climas tropicales (Akkaya-Kalayci et al, 2017;Gao et al, 2019).…”

Section: Uso De Internet Y Tasas De Mortalidad Por Suicidiounclassified

El fenómeno de mortalidad por suicidio en México: patrones territoriales a partir de 20 años de información

Rivera

2020

estudios-socioterritoriales

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El objetivo es documentar la evolución temporal y distribución territorial del suicidio en México durante el periodo 1998-2017 con énfasis en el caso del estado de Aguascalientes. La metodología considera análisis exploratorio de datos utilizando registros públicos de mortalidad provenientes del sistema nacional de información en salud a partir de dos estructuras de datos: corte transversal y series de tiempo. Los resultados indican que los estados de Chihuahua y Aguascalientes son los de mayor mortalidad actualmente. Se documentó un patrón temporal de mayor incidencia mensual para mayo y junio en el periodo de 20 años estudiado. Por su parte el análisis a escala de zona Metropolitana permite identificar a la ZM de Aguascalientes como la de mayor concentración específicamente afectando a la población entre los 12 y 32 años principalmente.

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Ambient temperature, sunlight duration, and suicide: A systematic review and meta-analysis

Cited by 104 publications

References 57 publications

Air Pollution and Suicide in Mexico City: A Time Series Analysis, 2000–2016

Air Pollution and Suicide in Mexico City: A Time Series Analysis, 2000–2016

Temporal patterns of suicide and circulatory system disease-related mortality are inversely correlated in several countries

El fenómeno de mortalidad por suicidio en México: patrones territoriales a partir de 20 años de información

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