For many people, symptoms of seasonal affective disorder, or SAD, begin to appear as the dusky season of fall encroaches upon us and then culminates during the dark winter months.

About 5% of adults suffer from SAD.

Up to 20% of people experience some 
symptoms of winter blues.

SAD is less common where there is 
snow on the ground.

SAD is four times more common 
in women than in men.

The average age of a person who first 
develops SAD is 23 years old.

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