"In a nutshell, this means that there is a control group of identical patients that does not receive the treatment of interest. The control group is like the study group in every other measurable way that might be relevant, such as average age, coexisting diagnoses, average weight, fraction that smoke, etc."
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database