Associations of Suicide Seasonality with Rural- Urban Residence and Mental Disorders in Ilam, Iran

Iranian Journal of Medical Sciences

Volume 41 - Number 5

Article Type: Letter to editor
Suicide is one of the ten leading causes of death in Western countries and the second leading cause in people aged 15-19 years. In recent decades, annual suicide attempts reportedly ranged from 2.6 to 1,100 per 100,000 people, while the rate of lifetime prevalence ranges from 750 to 5,930 per 100,000 worldwide.1 Studies regarding suicide in Iran showed that most attempts originated in urban areas, and a recent systematic review focusing on seasonal variation indicated that most suicides were committed in the spring and summer seasons.2
The two leading models describing the effect of seasons on suicide are the bioclimatic and socio-demographic models. The bioclimatic model analyzes the ways in which climate-related and environmental factors (e.g. heat) influence the springtime peak in suicide rates, likely as a result of increased excitability in the nervous system. The socio-demographic model proposes that the spring peak is a consequence of increased occupational and public activity.3 Utilizing a set of representative and fresh data, the present study aims at examining the seasonality of suicide. As the second objective, we also explored differences in seasonality between rural and urban areas, mental disorders, and genders.
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