In the various fields of healthcare, a<unk>  is a study of a group of individuals taken from the general<unk>  who share a common characteristic, such as age, sex, or health condition. This group may be studied for different reasons, such as their response to a drug or risk of getting a disease.
Population study
Natural history study
Multiple baseline design
Cohort study
Natural history group
Parallel study
Clinical study design
Intersalt study