Abstract
Objectives
Diagnosis of bipolar disorder (BD) increased substantially among youth between the mid-1990s and mid-2000s in the United States. This dramatic increase in diagnosis resulted in concern regarding the potential for misdiagnosis of BD among youth. However, the rate of BD diagnosis in the United States had not been evaluated nationally since the mid-2000s. It was unclear whether changes in diagnostic rates continued to occur. Therefore, the present study aimed to assess the pattern of longitudinal trends in the rate of national inpatient BD diagnosis subsequent to 2004.
Methods
Data included a nationally representative dataset of inpatient hospitalizations between 1996 and 2010. De-identified data were obtained from the National Hospital Discharge Survey (NHDS) conducted annually by the National Center for Health Statistics.
Results
The proportion of BD diagnoses relative to all psychiatric diagnoses increased between 1996 and 2004 among children and adolescents. The proportion of BD diagnoses then decreased between 2004 and 2010 among children but continued to increase for adolescents. However, population-adjusted rates of BD diagnosis per 10,000 individuals in the general population initially increased until the mid-2000s and then decreased until 2010 for both children and adolescents.
Conclusions
Rates of BD diagnosis substantially decreased for youth between the mid-2000s and 2010. This decline coincided with recommendations for more conservative diagnostic practices due to concerns about overdiagnosis and increasing awareness of the side effects of front-line medications used to treat BD in youth. Findings provide insight into changing trends in inpatient service utilization for BD in the United States.