Researchers identified and began following patients from a community health clin

Question

Researchers identified and began following patients from a community health clinic starting in January of 1988. Patients who came in for routine care between January and December 1988 were put into two groups – those that had an x - ray during that initial 1988 visit and those that didn’t. Patients were all followed for 20 years to determine if they developed cancer. What study type would this be?

a. Prospective cohort

b. Retrospective cohort

c. Cross - sectional

d. Case - control

e. Experimental

Explanation / Answer

Answer: Option a. Prospective cohort

because It  is a longitudinal cohort study that follows over time a group of similar individuals (cohorts) who differ with respect to certain factors under study, to determine how these factors affect rates of a certain outcome.

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