In the adults, borderline personality disorder was significantly comorbid only with another cluster B disorder. The adolescents, by comparison, displayed a broader pattern of comorbidity of borderline personality disorder, encompassing aspects of clusters A and C. These results suggest that the borderline personality disorder diagnosis may represent a more diffuse range of psychopathology in adolescents than in adults.

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The diagnosis of personality disorder in adolescent inpatients has good concurrent validity; however, the predictive validity of the diagnosis is mixed.

The level of PTSD diagnosis and symptoms in Bosnian refugees remained substantial 1 year after their resettlement in the United States, although there were notable overall decreases. Older refugees appeared to be at greater risk.

In hospitalized patients, borderline personality disorder and its symptoms appear to be as frequent for adolescents as for adults. Despite these surface similarities between groups with respect to symptom patterns, several differences were found at the level of the diagnostic efficiency for individual borderline personality disorder criteria. These differences may shed light on the nature of borderline psychopathology during adolescence.