Number of hypomanic, manic and depressive episodes in patients from Oslo with bipolar disorder.

Each double cell shows the number of hypomanic and manic episodes and the number of depressive episodes for a single patient. The median for the number of hypomanic and manic episodes is 3, and the median for the number of depressive episodes is 3.5. Patients having numbers of episodes above the median for both hypomanic and manic episodes and depressive episodes (bold types) are compared with patients having at least one type of episodes below or equal to the medians. p = 0.0045 for clusters 1+2+4 versus cluster 3 (Fisher's exact test, two-tailed).