EPIDEMIOLOGY


Figure 8: Prevalence by Age, UC30


Bernstein et al 2006 key findings:


• The prevalence of CD and UC increases with increasing age; it climbs to its peak level by age 30, and remains at this level, only decreasing after age 80.


PEDIATRIC EPIDEMIOLOGY


CD and UC also occur in children. In fact, 20-30% of IBD patients present with the illness before they are 20 years old. Given that the most common age of IBD onset is when a person is in their twenties, many 18 and 19 year olds will be diagnosed with IBD. However, pediatric IBD occurs not only in older teens, and is even diagnosed in children under the age of four. Canadian researchers have used health records in the province of Ontario to investigate pediatric IBD, among children exclusively under 18 years of age. These health records provided data on the largest population sample of pediatrics with IBD in the world, and defined IBD cases with a high level of accuracy.


The results showed that the prevalence of pediatric IBD in Ontario was higher than expected, and has been rising rapidly over the past decade. Prevalence increased from 42.1/100,000 in 1994 to 56.3/100,000 in 2005. Data by age group for the year 2005 are presented in Figure 9. Amongst IBD cases, CD was more common than UC (32.8 versus 20.3 cases per 100,000). IBD is more common in male children.


THE IMPACT OF INFLAMMATORY BOWEL DISEASE IN CANADA 36


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