Researchers perform a study on foot ulcers caused by diabetes. They collect patients of foot ulcers and divided them into a group of patients with diabetes and another group of non-diabetic patients. The researchers compute the rate of foot ulcers in diabetic patients versus non-diabetic patients.
This study is considered:
This study is case-control study as it is retrospective and compared an odds ratio. It is not prospective because the patients already had foot ulcers.
The correct answer is A