Figure 1 .

Approach to identifying UC patients who flared and those who underwent colectomy. α “Other Not UC”: Ischemic colitis n = 1, Pseudomembranous colitis n = 3, unspecified n = 12. β “Other Not UC”: Ischemic colitis n = 4, Pseudomembranous colitis n = 7, unspecified n = 23. δ “Previous colectomy”: Record of previous colectomy occurring before the study period 1996–2007 (n = 68), record of previous colectomy occurring in study period (n = 2). * Subset of colectomy patients (n = 15), not captured by administrative definition.

Ma et al. BMC Gastroenterology 2012 12:39   doi:10.1186/1471-230X-12-39
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