Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/119862
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Type: Journal article
Title: Association between solar insolation and a history of suicide attempts in bipolar I disorder
Author: Bauer, M.
Glenn, T.
Alda, M.
Andreassen, O.
Angelopoulos, E.
Ardau, R.
Ayhan, Y.
Baethge, C.
Bauer, R.
Baune, B.
Becerra-Palars, C.
Bellivier, F.
Belmaker, R.
Berk, M.
Bersudsky, Y.
Bicakci, Ş.
Birabwa-Oketcho, H.
Bjella, T.
Cabrera, J.
Wo Cheung, E.
et al.
Citation: Journal of Psychiatric Research, 2019; 113:1-9
Publisher: Elsevier
Issue Date: 2019
ISSN: 0022-3956
1879-1379
Statement of
Responsibility: 
Michael Bauer, Tasha Glenn, Martin Alda, Ole A. Andreassen, Elias Angelopoulos ... Bernhard T. Baune ... et al.
Abstract: In many international studies, rates of completed suicide and suicide attempts have a seasonal pattern that peaks in spring or summer. This exploratory study investigated the association between solar insolation and a history of suicide attempt in patients with bipolar I disorder. Solar insolation is the amount of electromagnetic energy from the Sun striking a surface area on Earth. Data were collected previously from 5536 patients with bipolar I disorder at 50 collection sites in 32 countries at a wide range of latitudes in both hemispheres. Suicide related data were available for 3365 patients from 310 onset locations in 51 countries. 1047 (31.1%) had a history of suicide attempt. There was a significant inverse association between a history of suicide attempt and the ratio of mean winter solar insolation/mean summer solar insolation. This ratio is smallest near the poles where the winter insolation is very small compared to the summer insolation. This ratio is largest near the equator where there is relatively little variation in the insolation over the year. Other variables in the model that were positively associated with suicide attempt were being female, a history of alcohol or substance abuse, and being in a younger birth cohort. Living in a country with a state-sponsored religion decreased the association. (All estimated coefficients p < 0.01). In summary, living in locations with large changes in solar insolation between winter and summer may be associated with increased suicide attempts in patients with bipolar disorder. Further investigation of the impacts of solar insolation on the course of bipolar disorder is needed.
Keywords: Bipolar disorder; Seasonal variation; Solar insolation; Suicide; Sunlight
Rights: © 2019 Elsevier Ltd. All rights reserved.
RMID: 0030111924
DOI: 10.1016/j.jpsychires.2019.03.001
Grant ID: http://purl.org/au-research/grants/nhmrc/APP1059660
http://purl.org/au-research/grants/nhmrc/APP1156072
Appears in Collections:Psychology publications

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