1 in 10 seems very, very high.
I found this online:
In This Article
Personality disorders can be confusing since many have similar or even overlapping characteristics. In order to better differentiate one from the next, the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) grouped the various disorders into three clusters, each of which is characterized by a shared and distinctive personality feature.
According to the National Institute of Mental Health (NIMH), 9.1 percent of Americans over 18 have at least one personality disorder.
Understanding Personality Disorders
Your personality is defined by how you think, behave, and feel. A personality disorder is not simply about thinking, feeling, or behaving differently than would be expected; It is a persistent deviation from cultural expectations that causes distress and makes it difficult to function.
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At its heart, a personality disorder characterized by an unhealthy and rigidity pattern of behavior that interferes with your ability to perceive or relate to situations or people, enjoy life, maintain meaningful relationships, and do well at school or work.
Classifying Cluster B Disorders
There are 10 specific types of personality disorders, which DSM-5 breaks into three clusters. Cluster A is defined as odd or eccentric behavior that affects 5.7 percent of adults. Cluster C personality disorders consist of fearful and anxious behaviors, affecting 6 percent of adults.
Cluster B personality disorders are characterized by dramatic, overly emotional, or unpredictable thinking or behaviors. They include antisocial personality disorder, borderline personality disorder, narcissistic personality disorder, and histrionic personality disorder. These tend to be the least common but often most challenging to treat involving 2.7 percent of adults