12-22-2009, 01:53 PM
12-22-2009, 02:42 PM
Define Cohort versus Randomized study please!
12-22-2009, 03:17 PM
cohort study compares a group with the given risk factor with the group without risk factors, its an observational study .
while randomised study is experimental , which compares therapeutic benefits of some drug on grp of ppl compared to placebo grp , shud be double blinded to get fair result
while randomised study is experimental , which compares therapeutic benefits of some drug on grp of ppl compared to placebo grp , shud be double blinded to get fair result
12-22-2009, 03:33 PM
A "cohort" of individuals is classified acording to exposure and then followed to determine the efect of exposure on disease outcome. ( The exposure being studied may correlate with the disease outcome, but may NOT be the cause).
In a randomized study: participants are randomized into exposure groups and followed for the development of disease./ provides evidence for cause and not just correlation because only one 'exposure" is manipulated at a time. (cannot be used to study exposures that are known or suspected to be harmful).
In a randomized study: participants are randomized into exposure groups and followed for the development of disease./ provides evidence for cause and not just correlation because only one 'exposure" is manipulated at a time. (cannot be used to study exposures that are known or suspected to be harmful).