Maladaptive Personality Traits and Internalizing and Externalizing Problems: The Role of Borderline and Narcissistic Features in Adolescence.

This study provides more evidence of the associations between maladaptive personality traits and adolescent internalizing and externalizing problems: (1) confirming that borderline traits are crucial beyond gender, (2) stressing the importance of considering both grandiose and vulnerable narcissistic traits, and (3) highlighting the adaptive value of narcissistic vulnerability in capturing the adolescent crisis. The implications for clinical practice and intervention are also discussed.