Re: @ James 51
But this isn't correlation, is it?
The asthma caused the medical team to be more attentive
That extra medical attention caused the improved pneumonia outcomes
Therefore, asthma is on the causal pathway, no? A corrolation would be having an inhaler, which is only corrolated with having asthma, rather than causing it, and so is not on the causal pathway, if I understand correctly.