Seasonal Changes in Suicide in the United States, 1971 to 2000

Bridges, F. Stephen

doi:10.2466/pms.100.3.920-924

Cited by 24 publications

(10 citation statements)

References 11 publications

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“…Differences in suicide rate across seasons have been reported by several researchers in the northern hemisphere (Bridges et al, 2005;Fossey & Shapiro, 1992;Goodwin & Jamison, 1990;Kalediene et al, 2006;Wehr & Rosenthal, 1989). In spite of agreement about the existence of such variation, the participating factors have yet to be satisfactorily determined.…”

Section: Introductionmentioning

confidence: 78%

Seasonal Variation of Suicide in Brazil

Benedito‐Silva

Pires

Calil

2007

Chronobiology International

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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.

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Section: Introductionmentioning

confidence: 78%

Seasonal Variation of Suicide in Brazil

Benedito‐Silva

Pires

Calil

2007

Chronobiology International

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“…It is important to mention that seasonality of suicide in Denmark is decreasing (Yip et al 2006), which is consistent with the trends seen in Sweden (Rihmer et al 1998), England and Wales (Yip et al 2000) and Hong Kong (Yip and Yang 2004). However, in other countries, such as (Hakko et al 1998, Rasanen et al 2002, Partonen et al 2004), and the United States (Bridges et al 2005) , the seasonal suicidal peaks do not show any abatement.…”

Section: Discussionmentioning

confidence: 95%

Seasonal spring peaks of suicide in victims with and without prior history of hospitalization for mood disorders

Postolache

Mortensen

Tonelli

et al. 2010

Journal of Affective Disorders

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“…According to Chew and McCleary (1995), suicide seasonality tends to decrease as areas become more industrialized, so most locations in the United States, even those in predominantly agricultural regions, might experience less suicide seasonality than other countries. However, more recent studies have shown increases in suicide seasonality with time in industrialized countries (Bridges et al 2005;Rock et al 2003).…”

Section: Discussionmentioning

confidence: 98%

Effects of temperature variation on suicide in five U.S. counties, 1991–2001

et al. 2007

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Effects of weather variables on suicide are well-documented, but there is still little consistency among the results of most studies. Nevertheless, most studies show a peak in suicides during the spring season, and this is often attributed to increased temperatures. The purpose of this study is to test the relationship between monthly temperature and monthly suicide, independent of months or seasons, for five counties located across the United States. Harmonic analysis shows that four of the five counties display some seasonal components in the suicide data. However, simple linear regression shows no correlation between suicide and temperature, and discriminant analysis shows that monthly departure from mean annual suicide rates is not a useful tool for identifying months with temperatures that are colder or warmer than the annual average. Therefore, it appears that the seasonality of suicides is due to factors other than temperature.

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Seasonal Changes in Suicide in the United States, 1971 to 2000

Cited by 24 publications

References 11 publications

Seasonal Variation of Suicide in Brazil

Seasonal Variation of Suicide in Brazil

Seasonal spring peaks of suicide in victims with and without prior history of hospitalization for mood disorders

Effects of temperature variation on suicide in five U.S. counties, 1991–2001

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