Associations between ambient temperature and suicide: а systematic review

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Abstract

BACKGROUND: Over the past 150 years, a large number of articles have been published around the world on the associations between ambient temperature and suicide. However, only in the last 30 years daily data with sufficient validity are in use, necessitating the systematization of the latest research evidence.

AIM: To conduct a systematic selection and qualitative synthesis of published information on the associations between ambient air temperature and suicide from 1990.

MATERIALS AND METHODS: A systematic review using PRISMA criteria. Studies published in peer-reviewed journals from January 1990 to April 2022 in PubMed and eLIBRARY in Russian or English, respectively, comprised the study base.

RESULTS: Of the 1932 identified articles, 32 empirical studies with the number of cases ranging from 225 to 1,067,333 from 26 countries were included in the qualitative synthesis. In addition to mean temperatures, the minimum and maximum temperatures, as well as the calculated apparent mean, minimum and maximum temperature were used. In some studies, the difference in temperature between the index and the previous day were used. By design, most studies had ecological or case-crossover design. Generalized Additive Models (GAM) were used as the main analytical tools, and in multicenter studies the results were obtained using meta-regression. The results were presented as relative risks or the percentage increase in the number of suicides with an increase in temperature by 1 °C. Virtually all studies reported a significant linear relationship between the temperature and suicide rates, but effect sizes varied between countries. The effect was more pronounced in temperate climate, in men and people over 65 years of age.

CONCLUSIONS: Most of the studied suggest a direct relationship between high air temperature and the number of suicides in different latitudes. It is necessary to monitor the situation and study the mechanisms behind the associations between high temperatures and the risk of suicide to minimize the consequences of climate change for public health.

About the authors

Andrej М. Grjibovski

Northern State Medical University; Northern (Arctic) Federal University; M.K. Ammosov North-Eastern Federal University

Author for correspondence.
Email: a.grjibovski@yandex.ru
ORCID iD: 0000-0002-5464-0498
SPIN-code: 5118-0081

MD, MPhil, PhD

Russian Federation, Arkhangelsk; Arkhangelsk; Yakutsk

Ivan М. Kobelev

Northern State Medical University

Email: ivan_kobelev_2017@mail.ru
ORCID iD: 0000-0002-9414-4595
SPIN-code: 4111-9474
Russian Federation, Arkhangelsk

Natalia N. Kukalevskaya

Northern State Medical University

Email: n.kukalevskaya@yandex.ru
ORCID iD: 0000-0003-3371-1485
SPIN-code: 1844-4439
Russian Federation, Arkhangelsk

Yulia A. Popova

Northern State Medical University

Email: antyulia811@gmail.com
ORCID iD: 0000-0003-1684-6636
SPIN-code: 8735-4220
Russian Federation, Arkhangelsk

Alexander V. Baranov

Northern State Medical University; Pitirim Sorokin Syktyvkar State University

Email: baranov.av1985@mail.ru
ORCID iD: 0000-0002-3543-1738
SPIN-code: 2548-4398

MD, Cand. Sci. (Med.), associate professor

Russian Federation, Arkhangelsk; Syktyvkar

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