Question normal

Dear All.
I found the article really interesting. Enlarging the time window for treatment would allow the physicians to make a more accurate evaluation of the patient and, consequently, to set up the best therapy.
I have a banal question. The study highlights that the intervention group benefits from the treatment for all the categories of the Rankin scale, except for death. I was wondering about the reason: is this strategy efficacious only in slightly compromised patents?
Thanks for the answer and thanks for your work!