Seasonal variation of manic and depressive symptoms in bipolar disorder

Objectives Analyses of seasonal variation of manic and depressive symptoms in bipolar disorder in retrospective studies examining admission data have yielded conflicting results. We examined seasonal variation of mood symptoms in a prospective cohort with long‐term follow‐up: the Collaborative Depression Study ( CDS ). Methods The CDS included participants from five academic centers with a prospective diagnosis of bipolar I or II disorder. The...