A researcher wants to identify lifestyle factors that increase the risk of stomach cancer in men.His study design involves enrolling 250 adult men who have stomach cancer,and 250 men who are cancer-free,but have similar characteristics and backgrounds as the men who have stomach cancer.The researcher collects and analyzes information about each participant's lifestyle.Based on this information,what kind of study is the researcher conducting?
A)Case-control study
B)Cohort study
C)Experimental study
D)In vivo study

Question

Quizplus · Accepted Answer

The researcher is enrolling participants who have already developed stomach cancer (cases) and comparing them to a group of individuals who do not have stomach cancer (controls). This type of study is a case-control study, which is used to identify risk factors for a disease or condition. The researcher is not actively manipulating any variables, so it is not an experimental study. In vivo studies involve testing on living organisms or cells, which is not indicated in this scenario. A cohort study would involve enrolling a group of individuals without the disease and following them over time to see who develops the disease, which is not the design described here.

A Researcher Wants to Identify Lifestyle Factors That Increase the Risk