Kaplan-Meier estimates of remaining free of proximal disease extension in patients with proctitis and left-sided colitis at diagnosis. The numbers in parentheses (after years from IBD diagnosis) refer to the numbers of patients at risk at the corresponding time points. Log-rank test p value: 0.003.
Chatzicostas et al. BMC Gastroenterology 2006 6:21 doi:10.1186/1471-230X-6-21