Early-onset psychotic disorders: Course and outcome over a 2-year period

Objective: To examine the course and outcome of early-onset psychotic disor ders. Method: These are data from a longitudinal, prospective study of yout hs with psychotic disorders. Standardized diagnostic and symptom rating mea sures were used. Results: Fifty-five subjects with the following disorders have been recruited: schizophrenia (n = 18), bipolar disorder (n = 15), psy chosis not otherwise specified (n = 15), schizoaffective disorder (n = 6), and organic psychosis (n = 1). Followup assessments were obtained on 42 sub jects at year 1 and 31 subjects at year 2. Youths with schizophrenia had mo re chronic global dysfunction, whereas subjects with bipolar disorder overa ll had better functioning. with a cyclical course of illness. However, acco rding to results of a regression model, premorbid functioning and ratings o f negative symptoms, but not diagnosis, significantly predicted the highest level of functioning over years 1 and 2. Conclusions: Course and level of functioning differentiated bipolar disorder from schizophrenia. However, pr emorbid functioning and ratings of negative symptoms were the best predicto rs of functioning over the follow-up period. These findings are consistent with the adult literature, and they further support that psychotic illnesse s in young people are continuous with the adult-onset forms.