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Does temperature or sunshine mediate the effect of latitude on affective temperaments? A study of 5 regions in Japan

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Title: Does temperature or sunshine mediate the effect of latitude on affective temperaments? A study of 5 regions in Japan
Authors: Inoue, Takeshi Browse this author →KAKEN DB
Kohno, Kentaro Browse this author
Baba, Hajime Browse this author
Takeshima, Minoru Browse this author
Honma, Hiroshi Browse this author
Nakai, Yukiei Browse this author
Suzuki, Toshihito Browse this author →KAKEN DB
Hatano, Koji Browse this author
Arai, Heii Browse this author →KAKEN DB
Matsubara, Shigehiro Browse this author
Kusumi, Ichiro Browse this author →KAKEN DB
Terao, Takeshi Browse this author →KAKEN DB
Keywords: Latitude
Hyperthymic temperament
Issue Date: 1-Feb-2015
Publisher: Elsevier
Journal Title: Journal of affective disorders
Volume: 172
Start Page: 141
End Page: 145
Publisher DOI: 10.1016/j.jad.2014.09.049
PMID: 25451408
Abstract: Background: Previously, we compared the hyperthymic scores of residents in Sapporo, Koshigaya, and Oita (which are located at latitudes of 43 degrees N, 36 degrees N, and 33 degrees N in Japan, respectively) using the Temperament Evaluation of Memphis, Pisa, Paris and San Diego-auto questionnaire version (TEMPS-A). We found that residents who lived at lower latitudes had higher hyperthymic temperament scores; however, the mechanism of the effect of latitude on hyperthymic temperament remained unclear. The current study examined the mediators of the latitude effect in additional regions with different annual temperatures and amounts of ambient sunshine. Methods: The Japanese archipelago stretches over 4000 km from north to south and has four large islands: Hokkaido, Honshu, Shikoku, and Kyushu. In addition to the TEMPS-A previously reported data collected at Sapporo (latitude 43 degrees N), Koshigaya (36 degrees N), and Oita (33 degrees N), we collected the TEMPS-A data of 189 and 106 residents from Takaoka (36 degrees N) and Obihiro (42 degrees N), respectively. Taken together, these five regions have different patterns (i.e., highs and lows) of annual ambient total sunshine (hours) and mean temperature (degrees C). The effect of latitude, sunshine, and temperature on affective temperaments was analyzed for five Japanese regions. Results: Multiple regression analyses revealed that latitude predicted significant variance in hyperthymic temperament. Ambient temperature, but not sunshine, significantly affected hyperthymic temperament. Limitations: The light exposure that residents actually received was not measured. The number of regions studied was limited. The findings might not generalize to residents across Japan or other countries. Conclusions: The present findings suggest that latitude affects hyperthymic temperament, and ambient temperature might mediate this effect. (C) 2014 Elsevier B.V. All rights reserved
Type: article (author version)
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 井上 猛

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