The most common form of personality disorder is Borderline Personality Disorder (BPD).
BPD is characterized by a pervasive pattern of instability in interpersonal relationships, self-image, and emotions, as well as impulsive behaviors.
It is estimated that approximately 1.4% to 5.9% of the population experiences BPD.
While Obsessive-Compulsive Personality Disorder (OCPD) is also quite common, affecting approximately 7.9% of the population, it is not considered the most common form of personality disorder.
It is important to note that these statistics are based on research and may vary depending on the population studied and the methods used to collect data.
If you are concerned about your own or someone else's mental health, it is always best to consult with a qualified mental health professional.