Prevalence and correlates of bipolar spectrum disorder in the world mental health survey initiative.
Level 4 - case-series / case-control
Cross-sectional international epidemiological survey.
PubMed 21383262 · doi:10.1001/archgenpsychiatry.2011.12
What was done
Face-to-face, cross-sectional household surveys evaluated 61,392 community adults across 11 countries in the Americas, Europe, and Asia as part of the World Health Organization World Mental Health Survey Initiative. DSM-IV diagnoses for bipolar spectrum disorder (BPS)—including bipolar I (BP-I), bipolar II (BP-II), and subthreshold bipolar disorder—as well as clinical severity, role impairment, comorbidity, and treatment contact were evaluated using the fully structured, lay-administered Composite International Diagnostic Interview (CIDI 3.0).
What was found
Aggregate lifetime prevalences were 0.6% for BP-I, 0.4% for BP-II, 1.4% for subthreshold BP, and 2.4% for total BPS; 12-month prevalences were 0.4%, 0.3%, 0.8%, and 1.5%, respectively. Manic and depressive symptom severity and suicidal behavior increased monotonically from subthreshold BP to BP-I, though role impairment was comparable across subtypes. Severe role impairment was reported by 74.0% of respondents with depressive episodes and 50.9% with manic episodes. Three-quarters of individuals with BPS met criteria for at least one comorbid condition (predominantly anxiety disorders, especially panic attacks). Less than half of lifetime BPS cases received mental health care, dropping to 25.2% in low-income countries.
Why it matters
This study provides standardized international benchmarks for bipolar spectrum conditions, demonstrating that subthreshold presentations carry substantial disability and that unmet treatment needs are widespread globally, especially in lower-income settings.
Limits
The cross-sectional design relies on retrospective recall and cannot establish longitudinal trajectories. Diagnoses were determined by structured lay-administered interviews rather than semi-structured clinician evaluations. Institutionalized, hospitalized, and homeless individuals were excluded, potentially underestimating true prevalence and disability.
Cited by
- supports Bipolar disorder affects 1 to 2% of the global population.
- supports Bipolar disorder affects approximately 1% to 2% of the population.