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dc.contributor.authorBenedito-Silva, Ana Amelia [UNIFESP]
dc.contributor.authorPires, Maria Laura Nogueira [UNIFESP]
dc.contributor.authorCalil, Helena Maria [UNIFESP]
dc.identifier.citationChronobiology International. Philadelphia: Taylor & Francis Inc, v. 24, n. 4, p. 727-737, 2007.
dc.description.abstractMost of what is known about the seasonal variation in suicide rate originates from studies conducted in the northern hemisphere; very few studies have been done in the southern hemisphere. the purpose of the present study was to explore the possibility that in Brazil, the seasonal variation of suicides is a function of photoperiod. This was accomplished by analyzing monthly suicide data for a 12 yr period (1979 to 1990), within latitudes ranging from 2 degrees N to 33 degrees S. Single cosinor analyses with periods of 12 or 6 months were applied to time series of monthly total and suicidal deaths, separated by gender and state. Significant spring or early summer peaks of suicide were found only in the south of Brazil for both men and women, except for the latter in one state. These peaks did not coincide with those found for total deaths, which occurred in the autumn or winter in all areas. No significant six-month period was found. in the present study, the chance of a suicide was typically 10-17% higher during the peak period than during the other months of the year. Although this moderate seasonal effect might not be sufficient to justify planning large scale prophylactic interventions, those dealing with patients who have suicide ideation should be aware of this high risk time.en
dc.publisherTaylor & Francis Inc
dc.relation.ispartofChronobiology International
dc.rightsAcesso restrito
dc.titleSeasonal variation of suicide in Brazilen
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.description.affiliationUniv São Paulo, Sch Arts Sci & Classical Learning, BR-05508 São Paulo, Brazil
dc.description.affiliationUniversidade Federal de São Paulo, São Paulo Sch Med, Dept Psychobiol, São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, São Paulo Sch Med, Dept Psychobiol, São Paulo, Brazil
dc.description.sourceWeb of Science
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