Brancaleoni Greta, Nikitenkova Elena, Grassi Luigi, Hansen Vidje
Department of Clinical Psychiatry, Institute of Clinical Medicine, Faculty of Medicine, University of Tromsø, and Psychiatric Department, University Hospital North, Norway.
Epidemiol Psichiatr Soc. 2009 Oct-Dec;18(4):336-43.
Since the importance of latitude of living for the prevalence of Seasonal Affective Disorder (SAD) is unclear, the study aims to test the latitude hypothesis by comparing SAD in two rather similar groups of students living at latitudes far apart.
Two groups of students, 199 in Tromsø, Norway (690 N) and 188 in Ferrara, Italy (440 N) were asked to fill in the Seasonal Pattern Assessment Questionnaire.
Global Seasonality score (GS-score) was significantly higher in Italian than in Norwegian students, in females and in students with sleeping-problems. Norwegian students had significantly higher SAD prevalence in winter and in spring. Most people in both countries felt worst in October and November, and the prevalence of Autumn SAD was not significantly different between the two countries.
The hypothesis that SAD is linked to amount of environmental light and latitude of living was not supported.
由于生活纬度对季节性情感障碍（SAD）患病率的影响尚不清楚，本研究旨在通过比较生活在纬度相差较大的两个相似学生群体中的SAD情况来检验纬度假说。
两组学生，挪威特罗姆瑟的199名学生（北纬69°）和意大利费拉拉的188名学生（北纬44°）被要求填写季节性模式评估问卷。
意大利学生的全球季节性得分（GS得分）显著高于挪威学生，女性以及有睡眠问题的学生也是如此。挪威学生在冬季和春季的SAD患病率显著更高。两国大多数人在10月和11月感觉最差，两国秋季SAD的患病率没有显著差异。
SAD与环境光照量和生活纬度有关的假说未得到支持。
