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Mixed features in depressive and bipolar disorders: An updated systematic review
Veronica Grasso1, Carolina Hernandorena2, Micaela Dines3
1Centro Integrador de psicoterapias Conductuales Contextuales (Fundación CIPCO), Córdoba, Argentina.
Journal of Affective Disorders
|December 25, 2025
Summary
Mixed features are common in major depressive disorder (MDD) and bipolar disorder (BD), occurring nearly twice as often in BD. Prevalence rates vary significantly based on diagnostic criteria used.
Area of Science:
- Psychiatry and Behavioral Sciences
- Mood Disorders Research
- Epidemiology of Mental Illness
Background:
- Mixed features in mood disorders are recognized but lack consistent prevalence estimates.
- Previous systematic reviews highlight the need for updated prevalence data for major depressive disorder (MDD) and bipolar disorder (BD).
Purpose of the Study:
- To provide updated prevalence estimates for mixed features in MDD and BD.
- To compare prevalence rates based on different diagnostic criteria (DSM-5 vs. ≥3 opposite-polarity features).
Main Methods:
- Systematic literature search across 5 databases for studies on adults with MDD or BD.
- Inclusion of studies assessing mixed features using DSM-5 criteria or identifying ≥3 opposite-polarity features.
- Independent data extraction and pooled prevalence rate calculation with confidence intervals.
Main Results:
- Analysis of 26 studies from 5 world regions.
- Mixed features found in 18.1% of MDD episodes and 32.8%-34.8% of BD episodes (depressive and [hypo]manic).
- Prevalence rates were nearly double in BD compared to MDD and varied significantly by diagnostic criteria.
Conclusions:
- Mixed features are highly prevalent in mood disorders, especially bipolar disorder.
- Current prevalence estimates are heavily influenced by the diagnostic criteria employed.
- Harmonization of diagnostic definitions is crucial for understanding prognostic and therapeutic implications.
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