Like cohort studies, the purpose of case-control studies is to establish association between exposure to risk factors and disease. Unlike cohort studies, however, members of the population with the ...

A cohort study is one in which a group of subjects, selected to represent the population of interest, is studied over time. Much like a cross-sectional study, information is collected about the ...

Noninferiority clinical trials have become a major tool for the evaluation of drugs, devices, biologics, and other medical treatments. Treatment with placebo or with a no-treatment control in a study ...