Researchers wanted to provide additional support for a causal association between human papillomavirus (HPV) and oropharyngeal cancers.They performed an epidemiologic study of 100 patients with newly diagnosed oropharyngeal cancer and 200 control patients without cancer to evaluate associations between HPV infection and oropharyngeal cancer.[D'souza G,Kreimer AR,Viscidi R,et al.A study of human papillomavirus and oropharyngeal cancer.N Engl J Med.2007;356(19):1944-1956.] What kind of study design is this?
A) Retrospective cohort study
B) Prospective cohort study
C) Case-control study
D) Randomized trial
E) Case report

Question

Quizplus · Accepted Answer

Investigators classified participants by disease status,cases,and controls,then investigated the exposure status."Retrospective cohort study" and "Prospective cohort study" are not correct; they did not follow up the participants in either direction."Randomized trial" is not correct; they did not randomly allocate exposure status."Case report" is not correct; they did not report a single or series of disease cases.

Researchers Wanted to Provide Additional Support for a Causal Association