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Early-onset versus late-onset bipolar II chronic depression
1Department of Psychiatry, National Health Service (A.USL), Foril, Italy. f.benazzi@fo.nettuno.it
Depression and Anxiety
|March 10, 2001
Summary
Early-onset (EO) bipolar II depression differs clinically from late-onset (LO) bipolar II depression. This study supports subtyping bipolar II disorder based on age at onset for better classification.
Area of Science:
- Psychiatry
- Mood Disorders
- Bipolar Disorder Classification
Background:
- Age at onset is a key factor in mood disorder classification.
- Previous research supports early-onset (EO) versus late-onset (LO) unipolar chronic depression subtyping.
- Clinical differences between EO and LO bipolar II chronic depression require investigation.
Purpose of the Study:
- To determine clinical differences between EO and LO bipolar II chronic depression.
- To provide evidence supporting the subtyping of bipolar II disorder based on age at onset.
Main Methods:
- Eighty-seven bipolar II chronic depression outpatients were assessed.
- Structured Clinical Interview for DSM-IV, Montgomery Asberg Depression Rating Scale, and Global Assessment of Functioning scale were utilized.
- Early-onset was defined as onset before ages 21 or 23.
Main Results:
- Lower age at onset correlated with younger age, longer illness duration, and less severe symptoms.
- Early-onset bipolar II depression showed more atypical features and greater Axis I comorbidity.
- Less psychosis was observed in the early-onset group.
Conclusions:
- Clinical differences between early-onset and late-onset bipolar II chronic depression support this subtyping.
- Age at onset is a significant dimension for classifying bipolar II disorder.
- Subtyping may lead to more refined diagnostic and treatment approaches.