I have no idea.
For example, the data used for doing the UNICEF report that some people have talked about is the HBSC data funded by Health Canada, but it is not accessible to researchers. I have tried to obtain it, I promise. It is impossible to access that data, even though it is collected using public funds and is used to position Canada on the world stage.
This isn't data that comes from Statistics Canada. We can't validate or verify the data. The methodology used is not easy to understand, to make sure the research has been done properly, and we can't be certain that the samples used are representative of Canada.
In my opinion, assigning the data collection to an organization of researchers rather than to Statistics Canada, for ranking Canada in the world, makes no sense. I don't know what logic is behind this arrangement, but this kind of funding, which is allocated here and there around the country, is very common.