PMID: 11926077Apr 3, 2002Paper

Seasonal affective disorders: relevance of Icelandic and Icelandic-Canadian evidence to etiologic hypotheses

Canadian Journal of Psychiatry. Revue Canadienne De Psychiatrie
Jóhann AxelssonMikael M Karlsson

Abstract

This study tests the suggestion of earlier studies concerning the importance of genetic factors in the etiology of winter seasonal affective disorders (SADs) and subsyndromal winter SAD (S-SAD). Two study populations of Winnipeg, Manitoba residents were canvassed: 250 adults of wholly Icelandic descent and 1000 adults of non-Icelandic descent. We distributed the Seasonal Pattern Assessment Questionnaire by mail to these 2 populations, yielding 204 and 449 valid responses, respectively. Rates of SAD and S-SAD proved markedly lower in the Icelandic population than those in the non-Icelandic population. These differences seem unexplained by differences in ambient light or climate, thus indicating that genetic factors contribute to the expression of SADs. Compared with earlier findings from a group of adults of wholly Icelandic descent living in nearby rural Manitoba, the etiologic importance of as-yet-undetermined environmental factors unrelated to latitude or ambient light is also indicated.

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Citations

May 2, 2003·Chronobiology International·Andres Magnusson, Diane Boivin
Jul 26, 2005·CNS Spectrums·Andres Magnusson, Timo Partonen
Nov 8, 2002·Canadian Journal of Psychiatry. Revue Canadienne De Psychiatrie·Erin E Michalak, Raymond W Lam
Nov 6, 2004·International Journal of Circumpolar Health·Jóhann AxelssonRagnar Sigbjörnsson
Jul 1, 2008·Epidemiologia e psichiatria sociale·Vidje HansenEiliv Lund
Jul 17, 2019·European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery·Rehab TalatAhmad R Sedaghat
Jul 16, 2004·International Journal of Circumpolar Health·Jóhann AxelssonRagnar Sigbjörnsson
Nov 5, 2003·International Journal of Circumpolar Health·Nancy K McGrath-HannaAbel Bult-Ito
Jul 15, 2015·The Laryngoscope·Young H Kim
Jan 22, 2021·Psychiatry Research·Yvonne HöllerGudmundur T Heimisson
Jul 18, 2017·General and Comparative Endocrinology·Anna Wirz-Justice

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