GSS scores increased systematically according to latitude from 62oN and onwards, while no systematic pattern was found between 58oN and 62oN. At all latitudes, GSS scores and SAD-prevalences were higher than measured in corresponding populations elsewhere in the world. Results support a relationship between reduced daylight exposure and Seasonal Affective Disorder. Measurements include three periods of dark season when the sun does not rise from mid November to late January and two periods of midnight sun season when the sun does not set from mid May to late July. Preliminary results show a linear relationship between seasonal variation in daylight exposure and scores on BDI, with higher depression scores during winter than during summer.
Results indicate seasonal variation in depression.
Results support a relationship between natural light exposure and positive affect. Measurements include three periods of dark season with no sunrise from mid November to late January and two periods of midnight sun season with no sunset from mid May to late July. Results indicate a linear association between natural light exposure and positive affect. EDS scores increased systematically according to latitude from 62oN and onwards. Measurements include three periods of dark season with no sunrise from mid November to late January and two periods of midnight sun season with no sunset from mid May to late July.