I will actually say that part of it is similar to my response for other countries. I don't know the detail of how they go about their process, so in comparison I can't give you the answer. I can tell you that when experts look at the same literature there often are different views that come to the fore and decisions that are made, based on those perspectives.
If they applied the same rules of evidence that the common drug review uses and those that are applied by the Cochrane group and by British Columbia, I expect they would come to the same conclusions. I just don't know that they have done that.