When we are interested in cause and effect relationships (which is much of the time!) we have two options: We can simply observe the world to identify associations between X and Y, or we can randomise ...

5 Samsung Genome Institute, Samsung Medical Center, Seoul, Korea (the Republic of) Correspondence to Professor Hong-Hee Won, SAIHST, Seoul 06351, Korea (the Republic of); wonhh{at}skku.edu; Professor ...

Explaining the concept of randomisation in simple terms to patients during the discussion of randomised clinical trials can be a difficult task for many health care professionals. We report the ...

Objectives To assess how often stratified randomisation is used, whether analysis adjusted for all balancing variables, and whether the method of randomisation was adequately reported, and to ...