A science news article reported a study of the effect of coo

A science news article reported a study of the effect of cooling the blood of storke patients on the extent of recovery ninty days after the stroke. Researchers randomly assigned 58 severe-stroke patients to receive either tPA(the standard treatment for stroke) or tPA plus blood-chilling Regulators overseeing the study required a one-hour delay from the point at which tPA was given before cooling could be started. The researchers found no significant diffference in the effects of the two treatments on recovery. Researchers also noted that the recovery rate for both groups was worse than the average seen in stroke patients nationwide, but were not concerned. Why were they nconcerned?

Solution

They are not concerned because we don\'t know what kind of treatment they are getting (if they are getting any).

Here we are concerned with people getting tPA and tPA plus blood-chilling.

Otherwise, even if you are a sever-stroke patient, we cannot extend our study to you, and that\'s what happened here. The recovery rate of both groups are worse than the average seen nationwide.