Revista de Saúde Pública
On-line version ISSN 1518-8787
Print version ISSN 0034-8910
NEJAR, Kennedy A.; BENSENOR, Isabela M and LOTUFO, Paulo A.. Sunshine and suicide at the tropic of Capricorn, São Paulo, Brazil, 1996-2004. Rev. Saúde Pública [online]. 2007, vol.41, n.6, pp.1062-1064. Epub Oct 02, 2007. ISSN 1518-8787.
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.
Keywords : Suicide; Sunlight; Temporal distribution; Poisson distribution; Brazil.