A case-control study found higher exposure to gases, dusts, and fumes in the workplace among patients with bronchitis (an inflammation of the lungs) than among patients without bronchitis. What type of study is this?
A) Retrospective
B) Prospective

Question

Quizplus · Accepted Answer

A case-control study is retrospective because it looks back in time to compare exposure levels among subjects with a condition (cases) to those without the condition (controls).

A Case-Control Study Found Higher Exposure to Gases, Dusts, and Fumes