Updates

Statistics on the prevalence of Borderliner Personality Disorder are still evolving. The US National Institute of Health (NIH) cites the following figures for:

Borderline Personality Disorder (BPD): 1.6% of US adult population (ref. nimh.nih.gov/statistics/1Borderline.shtml)
Antisocial Personality Disorder: 1% of US adult population (nimh.nih.gov/statistics/1Antisocial.shtml)
Avoidant Personality Disorder: 5.2% of US adult population (nimh.nih.gov/statistics/1Avoidant.shtml)
Any personality disorders: 9.1% of US adult population (nimh.nih.gov/statistics/1ANYPERS.shtml. See also Lenzenweger MF, Lane MC, Loranger AW, Kessler RC (2007): DSM-IV personality disorders in the National Comorbidity Survey Replication. Biological Psychiatry, 62(6), 553-564. ncbi.nlm.nih.gov/pubmed/17217923).

However, recent research published by the same National Institute of Health (NIH) indicates that

BPD may afflict up to 5.9% of adults or approximately 14 million Americans (Grant BF, Chou SP, Goldstein RB, Huang B, et al. 2008 ncbi.nlm.nih.gov/pubmed/18426259), and
Narcissistic Personality Disorder (NPD) afflicts up to 6.2% of adults (Stinson FS, Dawson DA, Goldstein RB, Chou SP, Huang B, et al. 2008, ncbi.nlm.nih.gov/pubmed/18557663).

Some people fit both diagnoses. (Studies found that between 16% and 39% of people with BPD also have NPD; ref. bpd.about.com/od/relatedconditions/a/Narcissistic-Personality-Disorder.htm). As mentioned above, NIH experts estimate that nearly 10 percent of the US adult population has BPD and/or NPD (approx. 23 million Americans). Statistics in other countries are likely to be similar. BPD & NPD are important mental health illnesses all around the world.

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