Dwalingen in de methodologie. XVIII. Selecteren van controlegroepen

- The selection of a valid control group is important in case control studies and has therefore generated a fair amount of discussion in the epidemiologic literature.

- The proposal of the study usually determines the type of control group that should be selected.

- It is possible to select population controls, hospital controls, friends or relatives of patients or a variant of these.

- Each method has specific advantages and disadvantages. Random-digit dialling can be used to select population controls by telephone.

- This method is a valuable alternative when no registry exists.