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TOC GENERATION TEST: suicide and ambient temperature: a multi-country multi-city study

Kim, Y. and Kim, H. and Gasparrini, A. and Armstrong, B. and Honda, Y. and Chung, Y. and Ng, C. F. S. and Tobias, A. and Iniguez, C. and Lavigne, E. and Sera, F. and Vicedo-Cabrera , A.M. and Ragettli, M. S. and Scovronick, N. and Acquaotta, F. and Chen, B. Y. and Guo, Y. L. and Seposo, X. and Dang, T. N. and de Sousa Zanotti Stagliorio Coelho, M. and Saldiva, P. H. N. and Kosheleva, A. and Zanobetti, A. and Schwartz, J. and Bell, M. L. and Hashizume, M.. (2019) TOC GENERATION TEST: suicide and ambient temperature: a multi-country multi-city study. Environmental Health Perspectives, 127 (12). p. 117007.

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Official URL: https://edoc.unibas.ch/74216/

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Abstract

BACKGROUND: Previous literature suggests that higher ambient temperature may play a role in increasing the risk of suicide. However, no multi-country study has explored the shape of the association and the role of moderate and extreme heat across different locations. OBJECTIVES: We examined the short-term temperature-suicide relationship using daily time-series data collected for 341 locations in 12 countries for periods ranging from 4 to 40 y. METHODS: We conducted a two-stage meta-analysis. First, we performed location-specific time-stratified case-crossover analyses to examine the temperature-suicide association for each location. Then, we used a multivariate meta-regression to combine the location-specific lag-cumulative nonlinear associations across all locations and by country. RESULTS: A total of 1,320,148 suicides were included in this study. Higher ambient temperature was associated with an increased risk of suicide in general, and we observed a nonlinear association (inverted J-shaped curve) with the highest risk at 27 degrees C. The relative risk (RR) for the highest risk was 1.33 (95% CI: 1.30, 1.36) compared with the risk at the first percentile. Country-specific results showed that the nonlinear associations were more obvious in northeast Asia (Japan, South Korea, and Taiwan). The temperature with the highest risk of suicide ranged from the 87th to 88th percentiles in the northeast Asian countries, whereas this value was the 99th percentile in Western countries (Canada, Spain, Switzerland, the UK, and the United States) and South Africa, where nearly linear associations were estimated. The country-specific RRs ranged from 1.31 (95% CI: 1.19, 1.44) in the United States to 1.65 (95% CI: 1.40, 1.93) in Taiwan, excluding countries where the results were substantially uncertain. DISCUSSION: Our findings showed that the risk of suicide increased with increasing ambient temperature in many countries, but to varying extents and not necessarily linearly. This temperature-suicide association should be interpreted cautiously, and further evidence of the relationship and modifying factors is needed. https://doi.org/10.1289/EHP9999.
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Epidemiology and Public Health (EPH) > Environmental Exposures and Health > Physical Hazards and Health (Röösli)
UniBasel Contributors:Ragettli, Martina
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:National Institute of Environmental Health Sciences
ISSN:0091-6765
e-ISSN:1552-9924
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:05 Mar 2020 07:53
Deposited On:05 Mar 2020 07:53

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