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EPIDEMIOLOGY


Figure 2: Prevalence per 100,000 Population, by Province30 350 UC 300 CD 250 200 150 100 50 0 NS MB SK AB BC CDN (excl BC) CDN (incl BC)


key findings from 2000 Canadian IBD


Epidemiology Database Study: • Canadian prevalence was estimated at 468.1 per 100,000 for UC and CD combined, or 0.47% of the population.


• Prevalence was found to be lower than in the survey; typically, population surveys are over-estimates, as they rely on patient recall.


• Results were relatively consistent across provinces. The only exception in this study was BC, which had substantially lower prevalence. Therefore, a Canadian average was calculated by excluding BC.


• CD was more common than UC in all provinces except BC, where they were similar. • Females were substantially more likely than males to have CD (1.31 females for every 1 male). There was no gender difference for UC.


• Overall there was no difference in prevalence for urban versus rural settings for CD; for UC, there were 1.13 urban dwellers for every 1 rural dweller.


Quebec Study


Using the same case definition as the Canadian IBD Epidemiology Database Study, researchers in Quebec have conducted a similar study to determine the prevalence of CD in that province over the years 1993 to 2002. Over that period of time, the prevalence of CD rose steadily, from 82.6 in 1993 to 270.4 in 2002 (with an average prevalence of 189.7/100,000). For the year 2000 – the same year as the database study in the other provinces – the prevalence of CD in Quebec was 243/100,000.33


These results are in line with most other


provinces in the database study, and support that BC was an exception to the general pattern seen in the rest of Canada.


THE IMPACT OF INFLAMMATORY BOWEL DISEASE IN CANADA 31


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