Objective: The authors investigated the concurrent and predictive validity of the DSM-III-R diagnosis of personality disorder in adolescents by means of baseline and follow-up assessments of inpatients treated at the Yale Psychiatric Institute.
Method: One hundred sixty-five hospitalized adolescents were reliably assessed by using a structured interview for personality disorder diagnoses as well as two measures of impairment and distress--the Global Assessment of Functioning Scale and the SCL-90-R. Two years after initial assessment, 101 subjects were independently reassessed with the same measures; their functioning was also assessed at this time.
Results: At baseline, adolescents with personality disorders were significantly more impaired than those without personality disorders. At follow-up, adolescents with a personality disorder diagnosis at baseline had used significantly more drugs and had required more inpatient treatment during the follow-up interval. Over time, the scores on the Global Assessment of Functioning Scale and SCL-90-R of adolescents diagnosed with a personality disorder at baseline became more similar to the scores of adolescents without a personality disorder.
Conclusions: The diagnosis of personality disorder in adolescent inpatients has good concurrent validity; however, the predictive validity of the diagnosis is mixed.