Why? The 0-3 age group represents only 3.75% of the population in Ottawa but had the same # of visits as the 18-54 age group which represents 49.9% of the population so a much higher percentage of the 0-3 age group is being impacted by respiratory infections resulting in ED visits.
Now you can see the real impact on age, where age 0-3 have the highest ED visit rate followed by age 4-11, and then age 80+ which get hidden when you only look at the raw provided numbers from OPH. 5/