Characteristics of children included in the sample are provided in Table 1. Among the 4,973 children who met eligibility criteria, approximately 29% were under 13 years of age at their index diagnosis date, and just under half were female. Approximately 34% of patients experienced inpatient mental health visits over the study period. Attention deficit hyperactivity disorder was the most commonly diagnosed condition in the 180 days prior to the patients’ index bipolar diagnosis, occurring in 25% of the children in the sample.
