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Heatwaves and Hospital Admissions for Mental Disorders in Northern Vietnam
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Epidemiology and Global Health.
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Epidemiology and Global Health.
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Psychiatry.
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2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 5, e0155609Article in journal (Refereed) Published
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Text
Abstract [en]

Studies in high-income countries have shown an association between heatwaves and hospital admissions for mental disorders. It is unknown whether such associations exist in subtropical nations like Vietnam. The study aim was to investigate whether hospital admissions for mental disorders may be triggered, or exacerbated, by heat exposure and heatwaves, in a low-and middle-income country, Vietnam. For this, we used data from the Hanoi Mental Hospital over five years (2008-2012) to estimate the effect of heatwaves on admissions for mental disorders. A zero-inflated negative binomial regression model accounting for seasonality, time trend, days of week, and mean humidity was used to analyse the relationship. Heatwave events were mainly studied as periods of three or seven consecutive days above the threshold of 35 degrees C daily maximum temperature (90th percentile). The study result showed heatwaves increased the risk for admission in the whole group of mental disorders (F00-79) for more persistent heatwaves of at least 3 days when compared with non-heatwave periods. The relative risks were estimated at 1.04 (0.95-1.13), 1.15 (1.005-1.31), and 1.36 (1-1.90) for a one-, three- and seven-day heatwave, respectively. Admissions for mental disorders increased among men, residents in rural communities, and the elderly population during heatwaves. The groups of organic mental disorders, including symptomatic illnesses (F0-9) and mental retardation (F70-79), had increased admissions during heatwaves. The findings are novel in their focus on heatwave impact on mental diseases in a population habituating in a subtropical low-and middle-income country characterized by rapid epidemiological transitions and environmental changes.

Place, publisher, year, edition, pages
2016. Vol. 11, no 5, e0155609
National Category
Public Health, Global Health, Social Medicine and Epidemiology Psychiatry
Identifiers
URN: urn:nbn:se:umu:diva-122564DOI: 10.1371/journal.pone.0155609ISI: 000376291100068PubMedID: 27195473OAI: oai:DiVA.org:umu-122564DiVA: diva2:949856
Available from: 2016-07-25 Created: 2016-06-20 Last updated: 2017-11-28Bibliographically approved
In thesis
1. Weather and extreme heat in association to mental disorders: The case of Hanoi, Vietnam
Open this publication in new window or tab >>Weather and extreme heat in association to mental disorders: The case of Hanoi, Vietnam
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Vietnam suffers consequences of global warming. There is limited data of the relationship between weather, extreme heat and potential mental health problems. It is therefore crucial to study heat-related mental illnesses and to establish good solutions with relevant adaptations to global warming. The adaptation measures should give attention to people that live in areas facing annual extreme weather, and protecting health in general and more specifically mental health of citizens. The study aimed to examine relationships between weather patterns, extreme heat or heatwaves, and mental disorders, and to investigate factors contributing to increased vulnerability and susceptibility.

Methods: The thesis includes a systematic review and a hospital-based study using data from the Hanoi Mental Hospital for five years (2008 – 2012), with mental disorders diagnosed by ICD10 (F00-99) to estimate the effects of weather variation, seasonality, increased temperatures, and heatwaves on hospital admissions for depression and other mental disorders. A negative binomial regression model accounting for yearly study period, time trends, and day of the week was used to analyze the relationship between seasonality, heatwaves, and monthly and daily mental disorder hospitalizations.

Results: Our findings showed (i) a general tendency for more admissions between May and December, with a seasonal bi-annual high between May-June and November-December, and elevated ambient temperature was significantly related to increasing admissions for depressive disorders; (ii) the number of hospital cases for mental disorders increased in the summer seasone specially in June, and two percent of cases emerged during elevated temperature of one degree Celsius; and (iii) when compared with non-heatwave periods, heatwaves amounted to increasing risks for admission for the whole group of mental disorders (F00-79), and admissions for mental disorders among residents in rural communities and in the elderly population increased significantly during heatwaves.

Conclusion: There were associations between hospital admissions for depression and other mental disorders and seasonality, weather patterns, elevated temperatures, and heatwaves. The associations grew stronger with the length of the heatwaves and particularly the elderly appeared more sensitive to seasonality, hot weather and heatwaves.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2017. 68 p.
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 1883
Keyword
Depressive disorders, mental disorders, weather patterns, elevated temperature, and heatwaves.
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Epidemiology
Identifiers
urn:nbn:se:umu:diva-131984 (URN)978-91-7601-674-9 (ISBN)
Public defence
2017-03-24, Sal 135, Allmänmedicin, byggnad 9A, Norrlands Universitetssjukhus, Umeå, 09:00 (English)
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Supervisors
Available from: 2017-03-03 Created: 2017-02-28 Last updated: 2017-05-04Bibliographically approved

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Trang, Phan MinhRocklöv, JoacimKullgren, GunnarNilsson, Maria

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