1. the boat has pretty much sailed on this. 2. correlation is not causation. 3. they've adjusted the numbers based on age instead of breaking out the numbers

1. the boat has pretty much sailed on this. 2. correlation is not causation. 3. they've adjusted the numbers based on age instead of breaking out the numbers by age. So, it's very possible age is important in making a distinction. There's no break out of pre-existing conditions among the groups.