Fig. 5: Calculations of IBD prevalence over time under scenarios of incidence rate change.
From: Global evolution of inflammatory bowel disease across epidemiologic stages
a, The prevalence in Canada under a 2%, 1%, 0%, −1% and −2% change in incidence per year, with the base incidence rate set equal to the average incidence from 2007 to 2014. b, The prevalence in Denmark under a 2%, 1%, 0%, −1% and −2% change in incidence per year, with the base incidence rate set equal to the average incidence from 2010 to 2017. c, The prevalence in Scotland under a 2%, 1%, 0%, −1% and −2% change in incidence per year, with the base incidence rate set equal to the average incidence from 2010 to 2017. d, Central difference approximations of the slopes of the time-dependent prevalence in Canada for each of the five yearly incidence rate change scenarios. e, Central difference approximations of the slopes of the time-dependent prevalence in Denmark for each of the five yearly incidence rate change scenarios. f, Central difference approximations of the slopes of the time-dependent prevalence in Scotland for each of the five yearly incidence rate change scenarios.
