Three times more days depressed than manic or hypomanic in both bipolar I and bipolar II disorder.
OBJECTIVE
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.
Kupka
Ralph W
RW
Altrecht Institute for Mental Health Care, Utrecht, The Netherlands. r.kupka@planet.nl
Altshuler
Lori L
LL
Nolen
Willem A
WA
Suppes
Trisha
T
Luckenbaugh
David A
DA
Leverich
Gabriele S
GS
Frye
Mark A
MA
Keck
Paul E
PE
McElroy
Susan L
SL
Grunze
Heinz
H
Post
Robert M
RM
D000328:Adult; D001714:Bipolar Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D010507:Periodicity; D013997:Time Factors