Occurrence of lung cancer was identified between May 1970 and July 2010 for 200,000 Japanese men who were regular smokers and 500,000 Japanese men who never smoked during the same period. This is an example of?

Question

Quizplus · Accepted Answer

This is a prospective cohort study because it follows two groups (smokers and non-smokers) over time to compare the incidence of lung cancer.

Occurrence of Lung Cancer Was Identified Between May 1970 and July