AS Biology Edexcel Topic 1 - Features of a good study

Cohort studies - A group of people (without the disease) followed over a long period of time to see if they develop the disease...

They are followed over such a long period of time (in a CVD/CHD study), due to the fact that CVD is not an immediate disease and takes a while for the symptoms/signs to show so will take a while to see if the effects of the medication/treatment.

Case-control studies - A group of people who have the disease (case) are…