ORIGINAL CONTRIBUTIONS: INFLAMMATORY BOWEL DISEASEAdministrative Database Studies in IBD: A Cautionary TaleKaplan, Gilaad G MD, MPH1Author Information 1Division of Gastroenterology, Departments of Medicine and Community Health Sciences, Inflammatory Bowel Disease Clinic, University of Calgary, Calgary, Alberta, Canada Correspondence: Gilaad G. Kaplan, MD, MPH, FRCPC, Division of Gastroenterology, Department of Medicine and Community Health Sciences, Inflammatory Bowel Disease Clinic, University of Calgary, 3280 Hospital Drive NW, 6th Floor, Room 6D17, Calgary, Alberta, Canada AB T2N 4N1. E-mail: [email protected] Received 8 March 2010; accepted 29 March 2010 American Journal of Gastroenterology: August 2010 - Volume 105 - Issue 8 - p 1808-1810 doi: 10.1038/ajg.2010.232 Buy Metrics Abstract The inflammatory bowel diseases (IBDs) have been extensively studied with administrative databases. Ananthakrishnanet al.(this issue) used an administrative database to develop a risk score that predicted disease severity in hospitalized Crohn's disease patients. To understand the implication of this work, the concept of risk adjustment is reviewed and the advantages and disadvantages of using administrative databases to study hospitalization outcomes in IBD patients are discussed. © The American College of Gastroenterology 2010. All Rights Reserved.