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In a study of the effects of smoking on lung cancer, 100 men with lung cancer...

In a study of the effects of smoking on lung cancer, 100 men with lung cancer were compared to 100 men without lung cancer. Among those with lung cancer, 80 had a previous history of smoking. Among the comparison group, 45 had a previous history of smoking. What type of study design was used for this investigation of the association between smoking and lung cancer?

Prospective cohort study

Retrospective cohort study

Case-control study

Clinical trial

None of the answers listed
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Answer #1

* o case control study. → Case Control study is a type of Obfervation Study in which two existing groups differing in outcome

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