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      Sunshine and suicide at the tropic of Capricorn, São Paulo, Brazil, 1996-2004 Translated title: Luz solar e suicídio no trópico de Capricórnio, São Paulo, Brasil, 1996-2004

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          Abstract

          Several studies have confirmed 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.

          Translated abstract

          Estudos epidemiológicos têm confirmado 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 verificar 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.

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          Most cited references13

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          Analysis of the seasonal pattern in suicide.

          Suicide has been attributed to social and psychological factors but also to geophysical effects. Of the latter, changes in solar radiation and geomagnetic activities may contribute to the frequency and the seasonal pattern of suicides. We studied with a population-based, nationwide analysis all the individuals who committed suicide (n=27,469) in Finland during the period of 1979 to 1999. The daily data on the number of suicides, and the mean and maximum levels of geomagnetic activity were compiled and modelled with Poisson regression using the number of inhabitants in each province as the denominator. Time series analysis of monthly numbers of suicides was carried out using a seasonal-trend decomposition procedure. There was a strong seasonal effect on suicide occurrence (P<0.00001), the risk of suicide being greatest in spring. The seasonal effect was most pronounced when the number of suicides was relatively low. High levels of solar radiation activity were associated with the increased risk of suicide (P=0.00001), but the effect of geomagnetic activity was weak. No individual data on alcohol consumption or mental disorders were available. Suicide occurrence varies markedly by season and needs attention where prevention is concerned.
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            A Role of Sunshine in the Triggering of Suicide

            Several reports indicate that suicide follows a seasonal pattern with a dominant peak during the month of maximum daylight. The purpose of this study was to evaluate the hypothesis that sunshine exposure may trigger suicidal behavior. We found a remarkably consistent pattern of seasonality with peak incidence around June in the northern hemisphere and December in the southern hemisphere. Moreover, there was a positive association between the seasonal amplitude of suicide (measured by relative risk) and total sunshine in the corresponding country. These findings indicate that sunshine may have a triggering effect on suicide, and suggests further research in the field of sunshine-regulated hormones, particularly melatonin.
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              Melatonin levels in drug-free patients with major depression from the southern hemisphere.

              The secretion of melatonin has been shown as abnormal in some depressed patients, but most such studies were conducted in the northern hemisphere and with severely depressed inpatients. The aim of this study was to evaluate melatonin excretion profiles in major depressive outpatients from São Paulo, Brazil, individually matched to well-screened healthy volunteers to examine whether melatonin abnormalities are also present in patients from the southern hemisphere, and in less severely ill patients. We analyzed 32 drug-free, depressed outpatients and 32 psychiatrically healthy volunteers matched for age and gender. We also examined a set of 15 drug-free depressed outpatients and 15 healthy volunteers that were matched not only for age and gender, but also for body mass index and season, all factors known to influence melatonin excretion in humans. All patients fulfilled DSM-IV criteria for major depression. We evaluated major urinary metabolite of melatonin, 6-sulphatoxymelatonin (aMT6s), produced over 24 h and divided into four periods (06:00-12:00, 12:00-08:00, 18:00-24:00 and 24:00-06:00 h). aMT6s measurements during the 24 and 6 h intervals were similar in the 32 depressed patients and 32 healthy volunteers matched for age and gender; further matching for body mass index and season did not alter the results. Our study supports others in which depressed patients were found to have similar melatonin levels than healthy volunteers. Melatonin excretion has been considered a physiological index for noradrenergic function, which in some studies were found to be altered than depressed patients. It is conceivable that the alteration of nocturnal melatonin in depressed patients occurs only in more severe depression.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rsp
                Revista de Saúde Pública
                Rev. Saúde Pública
                Faculdade de Saúde Pública da Universidade de São Paulo (São Paulo )
                1518-8787
                December 2007
                : 41
                : 6
                : 1062-1064
                Affiliations
                [1 ] Universidade de São Paulo Brazil
                [2 ] Universidade de São Paulo Brazil
                Article
                S0034-89102007000600024
                10.1590/s0034-89102007000600024
                237a5ce2-aa89-4d77-8c9d-81c8d701e9f2

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielosp.org/scielo.php?script=sci_serial&pid=0034-8910&lng=en
                Categories
                Health Policy & Services

                Public health
                Suicide,Sunlight,Temporal distribution,Poisson distribution,Brazil,Suicídio,Luz solar,Distribuição temporal,Distribuição de Poisson,Brasil

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