Three times more days depressed than manic or hypomanic in both bipolar I and bipolar II disorder

Ralph W. Kupka*, Lori L. Altshuler, Willem A. Nolen, Trisha Suppes, David A. Luckenbaugh, Gabriele S. Leverich, Mark A. Frye, Paul E. Keck, Susan L. McElroy, Heinz Grunze, Robert M. Post

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Objectives: To assess the proportion of time spent in mania, depression and euthymia in a large cohort of bipolar subjects studied longitudinally, and to investigate depression/mania ratios in patients with bipolar I versus bipolar II disorder.

Methods: Clinician-adjusted self-ratings of mood were completed daily for one year for naturalistically treated outpatients with bipolar I (n = 405) or bipolar II (n = 102) disorder. Ratings were analyzed for mean time spent euthymic, depressed, manic, hypomanic, and cycling, and the percentages of time spent ill were compared between the two groups.

Results: Percentages of time spent ill for bipolar I versus II patients were: euthymia 47.7% versus 50.2%; depression 36.0% versus 37.0%; hypomania 11.5% versus 9.8%; mania 1.0% versus 0.2%; and cycling 3.7% versus 2.8%. The depression/mania ratio was 2.9 in the bipolar I and 3.8 in bipolar II sub-groups.

Conclusions: Depression represents the predominant abnormal mood state for treated outpatients with bipolar I and II disorder. In contrast to other studies, we found that depression/mania ratios were of a similar magnitude, suggesting the same tendency towards mood instability in both sub-groups.

Original languageEnglish
Pages (from-to)531-535
Number of pages5
JournalBipolar Disorders
Issue number5
Publication statusPublished - Aug-2007


  • bipolar I disorder
  • bipolar II disorder
  • course of illness

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