Seasonality of mood disorders in adults with lifetime attention-deficit/hyperactivity disorder (ADHD). 
The objective of this study was to estimate the prevalence of Seasonal Affective Disorder (SAD) in adults with lifetime Attention-Deficit/Hyperactivity Disorder (ADHD).  Patients eligible for this study had lifetime impairing symptoms of ADHD and a current and/or past co-morbid mood disorder according to their medical record.  The Seasonal Pattern Assessment Questionnaire (SPAQ) was administered by a telephone interview to assess seasonality.  The overall rate of SAD in this clinical population of adults with ADHD was estimated at 27%.  Females were more at risk to develop SAD than men.  The SPAQ is a screening, not a diagnostic instrument.  SAD symptoms are frequently comorbid with ADHD in adults.  These results have clinical relevance for the recognition and treatment of SAD with bright light therapy in adults with ADHD.