Epidemiology
Lifetime prevalence is estimated at 1% in the general population and 2% to 16% in clinical populations.
In 2009, Twenge and Campbell conducted studies suggesting that the incidence of NPD had more than doubled in the US in the prior 10 years, and that 1 in 16 of the population have experienced NPD.
Read more about this topic: Narcissistic Personality Disorder