Researchers compare diagnostic profiles across three patient groups in a community mental health center. Group A shows persistent low mood, anhedonia, and sleep changes for several weeks. Group B shows alternating periods of elevated, expansive mood with decreased need for sleep and depressive episodes. Group C reports intrusive thoughts and repetitive behaviors performed to reduce distress.
Which feature most distinguishes Group A from Group B diagnostically?
- A
Group B has no depressive symptoms
- Bcheck_circle
Group B has experienced at least one manic or hypomanic episode
- C
Group A shows psychotic features
- D
Group A reports more intrusive thoughts
Explanation
The presence of at least one manic or hypomanic episode is the defining feature distinguishing bipolar disorder from major depressive disorder.