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.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalNeuropsychobiology
Volume57
Issue number1-2
DOIs
Publication statusPublished - Jun 2008

Fingerprint

Suicide
Population
Taiwan
Meteorological Concepts
Temperature
Atmospheric Pressure
Sunlight
International Classification of Diseases
Humidity
Climate
Mortality

Keywords

  • Nonviolent suicide
  • Seasonality
  • Violent suicide

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Neuroscience(all)
  • Psychology(all)

Cite this

Seasonality and climatic associations with violent and nonviolent suicide : A population-based study. / Lin, Herng Ching; Chen, Chin Shyan; Xirasagar, Sudha; Lee, Hsin Chien.

In: Neuropsychobiology, Vol. 57, No. 1-2, 06.2008, p. 32-37.

Research output: Contribution to journalArticle

@article{b9262c338b814a0b9241bb6f9e3c4de6,
title = "Seasonality and climatic associations with violent and nonviolent suicide: A population-based study",
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.",
keywords = "Nonviolent suicide, Seasonality, Violent suicide",
author = "Lin, {Herng Ching} and Chen, {Chin Shyan} and Sudha Xirasagar and Lee, {Hsin Chien}",
year = "2008",
month = "6",
doi = "10.1159/000129664",
language = "English",
volume = "57",
pages = "32--37",
journal = "Neuropsychobiology",
issn = "0302-282X",
publisher = "S. Karger AG",
number = "1-2",

}

TY - JOUR

T1 - Seasonality and climatic associations with violent and nonviolent suicide

T2 - A population-based study

AU - Lin, Herng Ching

AU - Chen, Chin Shyan

AU - Xirasagar, Sudha

AU - Lee, Hsin Chien

PY - 2008/6

Y1 - 2008/6

N2 - 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.

AB - 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.

KW - Nonviolent suicide

KW - Seasonality

KW - Violent suicide

UR - http://www.scopus.com/inward/record.url?scp=45549088302&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=45549088302&partnerID=8YFLogxK

U2 - 10.1159/000129664

DO - 10.1159/000129664

M3 - Article

C2 - 18451635

AN - SCOPUS:45549088302

VL - 57

SP - 32

EP - 37

JO - Neuropsychobiology

JF - Neuropsychobiology

SN - 0302-282X

IS - 1-2

ER -