Seasonal variation of suicide in Brazil

Seasonal variation of suicide in Brazil

Author Benedito-Silva, Ana Amelia Autor UNIFESP Google Scholar
Pires, Maria Laura Nogueira Autor UNIFESP Google Scholar
Calil, Helena Maria Autor UNIFESP Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Most 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.
Keywords suicide
seasonality
photoperiod
sex
latitude
Language English
Date 2007-01-01
Published in Chronobiology International. Philadelphia: Taylor & Francis Inc, v. 24, n. 4, p. 727-737, 2007.
ISSN 0742-0528 (Sherpa/Romeo, impact factor)
Publisher Taylor & Francis Inc
Extent 727-737
Origin http://dx.doi.org/10.1080/07420520701535795
Access rights Closed access
Type Article
Web of Science ID WOS:000249247300011
URI http://repositorio.unifesp.br/handle/11600/29399

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