Kaplan-Meier estimates of remaining free of change of disease behaviour in patients with B1 and B2 phenotypes 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: 0.073.
Chatzicostas et al. BMC Gastroenterology 2006 6:21 doi:10.1186/1471-230X-6-21