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how prevalent is SAD?

Prevalence of Seasonal Affective Disorder

As many as 1 in 20 people suffer from seasonal affective disorder (SAD). There are also geographical differences in the diagnosis of SAD. SAD becomes more common the further you get from the equator. Research suggests that while about 1% of people in Florida get SAD, it's closer to 10% in New Hampshire.

Many more people have milder versions of SAD -- their symptoms are still evident but not severe enough to qualify as a major depression.

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