- Psychosis affected ~53% of patients with bipolar disorder; schizophrenia comorbidity was ~8%.
- Psychosis was more common in bipolar I vs II (63% vs 17%).
- Manic episodes had higher psychosis rates than depressive episodes (~70% vs ~43%).
- Delusions were the most frequent symptom (55%), followed by hallucinations (31%).
- High heterogeneity (~95%–99%) limited consistency across studies.
Source: Bipolar Disorders
