Personality disorder rates are higher in high-income countries. Whereas about one in 10 American adults (if not slightly more) meet diagnostic criteria for a personality disorder, the worldwide prevalence is lower—sitting at about 8%, according to a 2020 literature review.

Put that with the 6.2%, and that makes it sound like most personality disorders are NPD. That sounds unbalanced and suspect. Where did you get that figure? Drag always heard 1% for each.