A study of cell phones and the risk of brain cancer looked at a group of 469 peo

Question

A study of cell phones and the risk of brain cancer looked at a group of 469 people who had brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race who did not have brain cancer, and then asked about their use of cell phones. Result: "Our data suggest that use of handheld cellular telephones is not associated with risk of brain cancer."

What type of study is this?

a) observational study: prospective

b) observational study: retrospective

c) observational study: cross-sectional

d) experiment: matched pairs design

e) experiment: randomized block design

f) experiment: completely randomized design

Explanation / Answer

This is an observational study: no treatment was assigned to the subjects; we merely observed cell phone usage (and presence/absence of cancer).

[ANSWER] a) observational study: prospective

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