In this series, I previously gave an overview of the main types of study design and the techniques used to minimise biased results. Here, I describe cross-sectional studies, their uses, advantages and ...

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 ...