The stability of axis I diagnoses in youth across multiple psychiatric hospitalizations

The literature has yet to reach a consensus as to the stability of severe psychiatric diagnoses in youth. Previous studies among youngsters tracked over set follow-up periods have reported diagnostic stability estimates that are similar to or slightly lower than those of adults. Less is known, however, about the stability of youth psychiatric diagnoses across multiple episodes of psychopathology, such as recurrent inpatient hospitalizations. The present study investigated diagnostic stability among inpatient youth with multiple hospitalizations through longitudinal and cross-sequential designs. Results indicate that diagnostic stability, as measured by positive concordance rates and the kappa coefficient, is highest for mood disorders, especially bipolar disorder. Externalizing disorders and schizophrenia displayed moderate to low stability, with oppositional-defiant disorder displaying the lowest stability. Substance use disorders were found to have moderate stability. Overall, across-episode diagnostic stability among hospitalized youngsters appears to be lower than that of adults. This finding appears to be due to lower stability among certain externalizing disorders and substance use disorders, whereas mood disorders display stability rates resembling those of adults. Potential explanations for and implications of these findings are discussed.