The spring peak in suicides: A cross-national analysis

Chew, Kenneth S. Y.; McCleary, Richard

doi:10.1016/0277-9536(94)e0070-9

Cited by 188 publications

(157 citation statements)

References 21 publications

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“…1c, d). These results correspond with previous reports showing the number of suicides to increase in spring [5][6][7]. We identified a relationship between geomagnetic disturbance and male suicides.…”

Section: Discussionsupporting

confidence: 92%

“…Risk factors associated with completed suicides have been identified, such as psychiatric illness, hopelessness, previous suicide attempts, being widowed or divorced, living alone, having a recent adverse event, having severe anxiety, having a chronic medical illness, and having a family history of suicide attempts or completions [2]. There have been some reports that environmental factors, such as electromagnetic fields [3,4], latitude [5,6], and season [5][6][7] were associated with suicides.…”

Section: Introductionmentioning

confidence: 99%

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Association of geomagnetic disturbances and suicides in Japan, 1999–2010

Tada

Nishimura

Nakatani

et al. 2013

Environ Health Prev Med

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Objectives Previous studies have shown a positive relationship between geomagnetic disturbances and an increased incidence of suicide. The Japanese suicide rate is the ninth highest in the world, but there have been no reports examining the relationship between geomagnetic disturbance and the number of suicides, and, therefore, this paper examines this relationship. Methods The number of Japanese suicides per month from January 1999 to December 2010 was obtained, and it was found that a total of 262,596 males and 102,539 females committed suicide during this period. To adjust the other factors which affect the number of suicides, a multiple linear regression analysis with backward elimination was carried out, with the monthly number of suicides as the response variable and the monthly mean K index value, monthly mean number of sunspots, monthly mean unemployment rate, proportion of elderly people (%), monthly mean air pressure (hPa), monthly mean air temperature (°C), monthly mean humidity (%), and monthly mean day length (h) as the explanatory variables. ResultsIn the multiple linear regression analysis for males, the monthly mean K index value was associated with the monthly number of suicides, but in females, the monthly mean K index value was not associated with the monthly number of suicides. Conclusion In this study, we generated a hypothesis that geomagnetic disturbances may trigger male suicides.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Association of geomagnetic disturbances and suicides in Japan, 1999–2010

Tada

Nishimura

Nakatani

et al. 2013

Environ Health Prev Med

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“…4,5 A less pronounced association was found in temperate zones, 2 and no association was seen in Singapore, located at the Equator line. 3 The present study data support the fi ndings of Chew & McCleary, 2 who compared suicidal behavior among 28 countries and concluded that seasonal variation in suicide is high in temperate zones (between 30° and 60° north and south of the Equator) and low in the tropics.…”

Section: Discussionmentioning

confidence: 92%

Sunshine and suicide at the tropic of Capricorn, São Paulo, Brazil, 1996-2004

Nejar

Lotufo²

2007

Rev. Saúde Pública

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Several studies have confi rmed seasonal variation in suicide rates according to hours of sunshine. The suicide pattern was assessed in São Paulo, southeastern Brazil, at the tropic of Capricorn from 1996 to 2004. Poisson regression was employed to estimate parameters of seasonality, as well as to verify associations for each day between daylight duration and suicide. During the nine-year study period, there were 3,984 suicides (76.9% in men; median age=38.7 years old). Seasonal averages of suicides were similar, as were monthly averages. Poisson regression did not reveal any association between suicide rates and hours of sunshine (p=0.45) for both sexes. In conclusion, no seasonal pattern was observed for suicides. RESUMOEstudos epidemiológicos têm confi rmado que as taxas de suicídio apresentam variação sazonal relacionada às horas de insolação. O padrão de suicídios foi analisado na cidade de São Paulo, Brasil, no trópico de Capricórnio, de 1996 a 2004. A regressão de Poisson foi utilizada para estimar padrões de sazonalidade, bem como verifi car a associação dia-a-dia entre duração da insolação e suicídio. Durante os nove anos houve 3.984 suicídios (76,9% homens; mediana de idade=38,7 anos). As médias de suicídio por estação do ano e por mês de suicídio foram similares. Segundo a regressão de Poisson, não houve associação entre insolação e suicídio (p=0,45) para ambos os sexos. Conclui-se que não houve padrão sazonal de suicídios na cidade de São Paulo. DESCRITORES:

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“…Seasonality was also observed for suicide with an increase in suicides rates in spring or early summer. This could be related to the seasonal mood disorders (Chew & McCleary 1995;Petridou et al 2002;Lambert et al 2003;Reutfors et al 2009). The aim of this study is to assess the prevalence of voluntary and involuntary admissions with particular reference to seasonality and clinical correlates, in a sample of patients consecutively admitted to our psychiatric unit during a period of 24 months.…”

Section: Objectivementioning

confidence: 99%

Involuntary admissions in Italy: the impact of seasonality

Aguglia

Moncalvo

Solia

et al. 2016

International Journal of Psychiatry in Clinical Practice

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Objective: The aim of this study is to assess the prevalence of involuntary admissions with regard to seasonality and clinical associated features, in a sample of patients admitted to a psychiatric unit in a period of 24 months. Methods: All subjects consecutively admitted to the Psychiatric Inpatient Unit of the San Luigi Gonzaga Hospital, Orbassano (University of Turin, Italy) from September 2013 to August 2015 were recruited. Socio-demographic and clinical characteristics were collected. Results: Seven hundred and thirty admissions in psychiatric ward were recognized. The prevalence of involuntary admission was 15.4%. Patients with involuntary hospitalizations showed a higher education level, a higher prevalence of admission in spring/summer with a significant peak in June, a longer duration of hospitalization and a lower suicide ideation. Among involuntary admissions, physical restraint and suicide attempts were more prevalent during spring compared to the other seasons. Conclusions: Seasonality has an important role in the psychopathology of psychiatric disorders, particularly in bipolar and related disorder, and may represent an influencing factor in hospital admissions and hospitalizations. Seasonal pattern must be considered while managing diagnosis and treatment of mental disorders, with regard to prevention and psychoeducation of patients.

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The spring peak in suicides: A cross-national analysis

Cited by 188 publications

References 21 publications

Association of geomagnetic disturbances and suicides in Japan, 1999–2010

Association of geomagnetic disturbances and suicides in Japan, 1999–2010

Sunshine and suicide at the tropic of Capricorn, São Paulo, Brazil, 1996-2004

Involuntary admissions in Italy: the impact of seasonality

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