The purpose of this study is:
* to find out out the number of children who develop crohn's disease (CD) and ulcerative colitis (UC) each year and are living with the disease and to see how this differs by age groups. * to understand how children of different age groups are treated over time and how their treatment changes as they grow. * to assess how often children use healthcare services and how much this costs for different age groups over several years.
CD and UC are long-term diseases that cause inflammation in intestine (part of digestive system) and develop ulcers.
Participants with at least two outpatient or one inpatient diagnosis codes for the same disease type (either CD or UC) using international classification of diseases, tenth revision (ICD-10) codes (K50. X for CD and K51. X for UC) recorded as primary or the first secondary diagnosis, and the codes for rare and intractable disease registration program (V130 for CD, V131 for UC) during the index period
Participants who received at least one prescription for conventional pediatric inflammatory bowel disease (IBD)-related medications (for example, 5-aminosalicylic acids [5-ASAs], exclusive enteral nutrition [EENs], corticosteroids, immunomodulators, or biologic drugs) during the index period
None