Table 1 Criteria for Seasonal Pattern Specifier 4

  1. Regular temporal relationship between the onset of major depressive episodes and a particular time of the year (unrelated to obvious season-related psychosocial stressors).

  2. Full remissions (or a change from depression to mania or hypomania) also occur at a characteristic time of the year.

  3. Two major depressive episodes meeting criteria A and B in last two years and no non-seasonal episodes in the same period.

  4. Seasonal major depressive episodes substantially outnumber the non-seasonal episodes over the individual's lifetime.

From: Light Therapy for Seasonal Affective Disorder (SAD)

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Minnesota Health Technology Assessments [Internet].
Minnesota Health Technology Advisory Committee.
St. Paul (MN): Minnesota Department of Health; 1995-2001.
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