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Seasonality of suicide in Shandong China, 1991–2009 : associations with gender, age, area and methods of suicide

Sun, Jiandong, Guo, Xiaolei, Ma, Jixiang, Zhang, Jiyu, Jia, Cunxian, & Xu, Aiqiang (2011) Seasonality of suicide in Shandong China, 1991–2009 : associations with gender, age, area and methods of suicide. Journal of Affective Disorders, 135(1-3), pp. 258-266.

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Abstract

Backgrounds Whether suicide in China has significant seasonal variations is unclear. The aim of this study is to examine the seasonality of suicide in Shandong China and to assess the associations of suicide seasonality with gender, residence, age and methods of suicide.

Methods Three types of tests (Chi-square, Edwards' T and Roger's Log method) were used to detect the seasonality of the suicide data extracted from the official mortality data of Shandong Disease Surveillance Point (DSP) system. Peak/low ratios (PLRs) and 95% confidence intervals (CIs) were calculated to indicate the magnitude of seasonality.

Results A statistically significant seasonality with a single peak in suicide rates in spring and early summer, and a dip in winter was observed, which remained relatively consistent over years. Regardless of gender, suicide seasonality was more pronounced in rural areas, younger age groups and for non-violent methods, in particular, self-poisoning by pesticide.

Conclusions There are statistically significant seasonal variations of completed suicide for both men and women in Shandong, China. Differences exist between residence (urban/rural), age groups and suicide methods. Results appear to support a sociological explanation of suicide seasonality.

Impact and interest:

8 citations in Scopus
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6 citations in Web of Science®

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ID Code: 48353
Item Type: Journal Article
Keywords: Suicide, Seasonality, Method of suicide, China
DOI: 10.1016/j.jad.2011.08.008
ISSN: 0165-0327
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PUBLIC HEALTH AND HEALTH SERVICES (111700) > Epidemiology (111706)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Public Health & Social Work
Copyright Owner: Copyright 2011 Elsevier B.V.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in the Journal of Affective Disorders. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in the Journal of Affective Disorders, Volume 135, Issues 1–3, December 2011, Pages 258–266, DOI: 10.1016/j.jad.2011.08.008
Deposited On: 01 Feb 2012 10:12
Last Modified: 16 Sep 2013 11:19

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