Vol. 57, No. 1-2, 2008
Issue release date: June 2008
Editor's Choice -- Free Access
Neuropsychobiology 2008;57:32–37
Original Paper
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Seasonality and Climatic Associations with Violent and Nonviolent Suicide: A Population-Based Study

Lin H.-C.a · Chen C.-S.c · Xirasagar S.e · Lee H.-C.b, d
aSchool of Health Care Administration and bDepartment of Psychiatry, School of Medicine, Taipei Medical University, cDepartment of Economics, National Taipei University, and dDepartment of Psychiatry, Taipei Medical University Hospital, Taipei, Taiwan; eArnold School of Public Health, University of South Carolina, Columbia, S.C., USA
email Corresponding Author

 goto top of outline Key Words

  • Violent suicide
  • Nonviolent suicide
  • Seasonality

 goto top of outline Abstract

Background: Using 7-year population-based data on Taiwan, we examined seasonal variation in violent versus nonviolent suicide, and its association with meteorological factors: ambient temperature, relative humidity, atmospheric pressure, rainfall and daily sunshine hours. Methods: We used Taiwan’s nationwide mortality data from 1997 to 2003, categorizing the sample decedents into two groups, violent (ICD-9-CM codes E953–E958) and nonviolent (E950–E952) suicide, based on the suicide method used. Seasonal autoregressive integrated moving average (SARIMA) modeling was used to detect seasonality of suicide, and the association of climate variables with violent versus nonviolent suicide. Results: The SARIMA test of seasonality was significant for both genders and the pooled sample (all p < 0.001) in violent suicide deaths, but not nonviolent suicides. Seasonal trends show a significant peak in March–May (early to late spring) for violent suicides. Increasing ambient temperature predicted increasing violent suicide rates. Conclusions: We conclude that seasonality exists in violent but not nonviolent suicide rates. Our findings suggest that suicide is a heterogeneous phenomenon and violent suicide may be more influenced by biochemical and chronobiological mechanisms.

Copyright © 2008 S. Karger AG, Basel

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 goto top of outline Author Contacts

Herng-Ching Lin
School of Health Care Administration, Taipei Medical University
250 Wu-Hsing Street
Taipei 110 (Taiwan)
Tel. +886 2 2736 1661, ext. 3613, Fax +886 2 2378 9788, E-Mail henry11111@tmu.edu.tw

 goto top of outline Article Information

Received: June 11, 2007
Accepted after revision: January 22, 2008
Published online: May 2, 2008
Number of Print Pages : 6
Number of Figures : 1, Number of Tables : 2, Number of References : 32

 goto top of outline Publication Details

Neuropsychobiology (International Journal of Experimental and Clinical Research in Biological Psychiatry, Pharmacopsychiatry, Biological Psychology/Pharmacopsychology and Pharmacoelectroencephalography)

Vol. 57, No. 1-2, Year 2008 (Cover Date: June 2008)

Journal Editor: Strik W. (Bern)
ISSN: 0302–282X (Print), eISSN: 1423–0224 (Online)

For additional information: http://www.karger.com/NPS

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