Table 1.

The database criteria for the diagnosis of IBD, UC, CD and IBDU

IBD	All patients had to have at least one hospitalization, or four physician claims, within a two year period for a diagnosis of IBD.
• IBD patients were then classified as UC, CD or IBDU as follows.
• Each medical contact for the Physician Billing claims database was scored as + 1 (UC) or -1 (CD).
• Each medical contact for the Discharge Abstract database was scored as +2 (UC) or -2 (CD).
• A cumulative score was calculated for each patient.
UC	Patients with a cumulative score greater than +2.
CD	Patients with a cumulative score less than -2.
IBDU	Patients with a cumulative score equal to, or between, -2 and +2.