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Family History and Solar Insolation in Bipolar I Disorder.

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Title: Family History and Solar Insolation in Bipolar I Disorder.
Authors: Bauer, M. (AUTHOR), Glenn, T. (AUTHOR), Achtyes, E. D. (AUTHOR), Alda, M. (AUTHOR), Agaoglu, E. (AUTHOR), Altınbaş, K. (AUTHOR), Andreassen, O. A. (AUTHOR), Angelopoulos, E. (AUTHOR), Ardau, R. (AUTHOR), Aydin, M. (AUTHOR), Ayhan, Y. (AUTHOR), Baethge, C. (AUTHOR), Bauer, R. (AUTHOR), Baune, B. T. (AUTHOR), Balaban, C. (AUTHOR), Becerra‐Palars, C. (AUTHOR), Behere, A. P. (AUTHOR), Belete, H. (AUTHOR), Belete, T. (AUTHOR), Belizario, G. Okawa (AUTHOR)
Source: Acta Psychiatrica Scandinavica. Apr2026, Vol. 153 Issue 4, p270-278. 9p.
Subjects: Family history (Medicine), Solar radiation, Spatial variation, Affective disorders, Bipolar disorder, Circadian rhythms, Gender differences (Sociology)
Abstract: Background: Sunlight has profound impacts on physical and mental health, beyond vision, including effects on circadian rhythms, alertness, mood, and sleep. A family history of any mood disorders is strongly associated with psychiatric disorders including bipolar disorder. The purpose of this study was to evaluate the association between a family history of any mood disorder in patients with bipolar I disorder and solar insolation at varied international onset locations. Methods: Data for this analysis were available from 5842 patients with a diagnosis of bipolar I disorder obtained at 83 collection sites in both hemispheres. This included 4752 patients from 71 collection sites in the northern hemisphere and 1090 patients from 12 collection sites in the southern hemisphere. Patient data variables were obtained from records or interviews. Solar insolation data were obtained from The National Aeronautics and Space Administration (NASA) Power database for each onset location, and the ratio of the mean monthly minimum/mean monthly maximum solar insolation was calculated. Typically, the ratio is largest near the equator (little yearly change in solar insolation) and smallest near the poles (large yearly change in solar insolation). Results: A significant relationship was found between a family history of any mood disorder, the ratio of the mean monthly minimum/mean monthly maximum solar insolation, and gender. The odds of a family history of mood disorder increased as patient location nears the poles and decreased near the equator. Female gender also increased the odds of having a family history of a mood disorder. Conclusions: This study highlighted the association between family history, solar insolation, and gender in international patients with bipolar I disorder. Given the profound effects of sunlight on human health, the family of patients with bipolar disorder who live in the same location with the same solar insolation, and especially females, may be at increased risk for a mood disorder. Summary: Significant outcomes○There is a significant association between family history of a mood disorder, solar insolation, and gender in international patients with bipolar I disorder.○The odds of a family history of a mood disorder increase as patient location nears the poles and decrease near the equator.○Family members who live in the same location and experience the same solar insolation, especially females, may be at increased risk for a mood disorder.Limitations○Family history was obtained from patient data. Family members were not interviewed.○Unique patient light exposure data was not obtained.○Individual patient sensitivity to light was not analyzed. [ABSTRACT FROM AUTHOR]
Copyright of Acta Psychiatrica Scandinavica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Family History and Solar Insolation in Bipolar I Disorder.
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  Data: <searchLink fieldCode="AR" term="%22Bauer%2C+M%2E%22">Bauer, M.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Glenn%2C+T%2E%22">Glenn, T.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Achtyes%2C+E%2E+D%2E%22">Achtyes, E. D.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alda%2C+M%2E%22">Alda, M.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Agaoglu%2C+E%2E%22">Agaoglu, E.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Altınbaş%2C+K%2E%22">Altınbaş, K.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Andreassen%2C+O%2E+A%2E%22">Andreassen, O. A.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Angelopoulos%2C+E%2E%22">Angelopoulos, E.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ardau%2C+R%2E%22">Ardau, R.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aydin%2C+M%2E%22">Aydin, M.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ayhan%2C+Y%2E%22">Ayhan, Y.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Baethge%2C+C%2E%22">Baethge, C.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bauer%2C+R%2E%22">Bauer, R.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Baune%2C+B%2E+T%2E%22">Baune, B. T.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Balaban%2C+C%2E%22">Balaban, C.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Becerra‐Palars%2C+C%2E%22">Becerra‐Palars, C.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Behere%2C+A%2E+P%2E%22">Behere, A. P.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Belete%2C+H%2E%22">Belete, H.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Belete%2C+T%2E%22">Belete, T.</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Belizario%2C+G%2E+Okawa%22">Belizario, G. Okawa</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Acta+Psychiatrica+Scandinavica%22">Acta Psychiatrica Scandinavica</searchLink>. Apr2026, Vol. 153 Issue 4, p270-278. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Family+history+%28Medicine%29%22">Family history (Medicine)</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+radiation%22">Solar radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Spatial+variation%22">Spatial variation</searchLink><br /><searchLink fieldCode="DE" term="%22Affective+disorders%22">Affective disorders</searchLink><br /><searchLink fieldCode="DE" term="%22Bipolar+disorder%22">Bipolar disorder</searchLink><br /><searchLink fieldCode="DE" term="%22Circadian+rhythms%22">Circadian rhythms</searchLink><br /><searchLink fieldCode="DE" term="%22Gender+differences+%28Sociology%29%22">Gender differences (Sociology)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Background: Sunlight has profound impacts on physical and mental health, beyond vision, including effects on circadian rhythms, alertness, mood, and sleep. A family history of any mood disorders is strongly associated with psychiatric disorders including bipolar disorder. The purpose of this study was to evaluate the association between a family history of any mood disorder in patients with bipolar I disorder and solar insolation at varied international onset locations. Methods: Data for this analysis were available from 5842 patients with a diagnosis of bipolar I disorder obtained at 83 collection sites in both hemispheres. This included 4752 patients from 71 collection sites in the northern hemisphere and 1090 patients from 12 collection sites in the southern hemisphere. Patient data variables were obtained from records or interviews. Solar insolation data were obtained from The National Aeronautics and Space Administration (NASA) Power database for each onset location, and the ratio of the mean monthly minimum/mean monthly maximum solar insolation was calculated. Typically, the ratio is largest near the equator (little yearly change in solar insolation) and smallest near the poles (large yearly change in solar insolation). Results: A significant relationship was found between a family history of any mood disorder, the ratio of the mean monthly minimum/mean monthly maximum solar insolation, and gender. The odds of a family history of mood disorder increased as patient location nears the poles and decreased near the equator. Female gender also increased the odds of having a family history of a mood disorder. Conclusions: This study highlighted the association between family history, solar insolation, and gender in international patients with bipolar I disorder. Given the profound effects of sunlight on human health, the family of patients with bipolar disorder who live in the same location with the same solar insolation, and especially females, may be at increased risk for a mood disorder. Summary: Significant outcomes○There is a significant association between family history of a mood disorder, solar insolation, and gender in international patients with bipolar I disorder.○The odds of a family history of a mood disorder increase as patient location nears the poles and decrease near the equator.○Family members who live in the same location and experience the same solar insolation, especially females, may be at increased risk for a mood disorder.Limitations○Family history was obtained from patient data. Family members were not interviewed.○Unique patient light exposure data was not obtained.○Individual patient sensitivity to light was not analyzed. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Psychiatrica Scandinavica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/acps.70075
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        Text: English
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        Type: general
      – SubjectFull: Solar radiation
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      – SubjectFull: Spatial variation
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      – SubjectFull: Affective disorders
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      – SubjectFull: Bipolar disorder
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      – SubjectFull: Circadian rhythms
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      – SubjectFull: Gender differences (Sociology)
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