A study of cell phones and the risk of brain cancer looked at a group of...

A study of cell phones and the risk of brain cancer looked at a group of 500 people who already have brain cancer. The investigators matched each brain cancer patient with a person of the same sex, age, and race of someone who did not have brain cancer. The researchers then asked these individuals about their use of cell phones. What type of study is this?

Question 1 options:

A)	Randomized Controlled Experiment

B)	Retrospective Study

C)	Prospective Study

D)	Randomized Experiment

E)	Unable to determine

Expert Solution

B) Retrospective Study : A retrospective study usually examines exposure of suspected risk/protection factors in relation to an outcome established at the start of the study. The study of cell phones and the risk of brain cancer the suspected risk that the exposure of cell phones cause brain cancer is being studied. It is a type of Case-Control Retrospective study. As two groups were selected, one consisting of subjects diagnosed with brain cancer and the other with a group of subjects in which a particular subject is of the same sex, age, and race as a particular brain cancer subject but did not have brain cancer, meaning it is a Case-Control study. And then they were asked to use their cell phones to study the effect of cell phones to examine the exposure of suspected risk, meaning it is a retrospective study. This type of study is good for rare outcomes and is often used for studies related to rare diseases.

Do comment for any doubts.

orchestra answered 2 years ago

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