Table 1.

Patient Variables

Variables included in both models

Demographics: age, sex, race.Labs: white blood cell count (WBC), hemoglobin, hematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular hemoglobin concentrate (MCHC), platelets, sodium, potassium, glucose, blood urea nitrogen (BUN), serum creatinine, calcium, bicarbonate, chloride, albumin, aspartate aminotransferase (AST), alanine aminotransferase (ALT), total protein, alkaline phosphatase, bilirubin.Immunosuppressive (escalation) med: included any immunosuppressive medication such as thiopurine, methotrexate, anti-TNF, or combination therapy.

Additional variables for longitudinal model

Previous hospitalization or steroid prescription: number of previous outpatient corticosteroids or hospitalizations. Calculated: mean, maximum, mean of the differential, maximum of the differential, and mean of acceleration of labs.