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What is the rate of incidence for seasonal affective disorder?

The rate of incidence of seasonal affective disorder (SAD) increases as one gets nearer to the poles of the Earth. At certain latitudes, winters tend to become harsher and sunlight much more scarce. In some parts of the world, darkness may fall for days at a time. The rate of incidence in the United States has been estimated between 1.5 and 9 percent of adults. The rate of incidence in a place further north, such as Finland, is at least 9.5 percent.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.