Key Statistics

These figures focus on prevalence, misdiagnosis, and public myths so visitors can understand both the scale of BPD and why accurate recognition matters.

1.4%

Past-Year U.S. Adult Prevalence

NIMH's National Comorbidity Study Replication estimate for borderline personality disorder.

Source 1

1.6-5.9%

Commonly Cited Prevalence Range

A wider range often cited across educational and clinical references when discussing BPD.

Sources 1-2

40%

Misdiagnosed as Bipolar II in One Study

NAMI cites evidence that many people meeting BPD criteria were misdiagnosed with Bipolar II.

Source 5

3:1

Current Diagnosis Ratio Often Reported

This reflects diagnosis patterns, not proof that only women have BPD. Men are often underdiagnosed.

Source 6