Compared to what? Finding controls for case-control studies.

@article{Grimes2005ComparedTW,
  title={Compared to what? Finding controls for case-control studies.},
  author={David A. Grimes and Kenneth F. Schulz},
  journal={Lancet},
  year={2005},
  volume={365 9468},
  pages={1429-33}
}
Use of control (comparison) groups is a powerful research tool. In case-control studies, controls estimate the frequency of an exposure in the population under study. Controls can be taken from known or unknown study populations. A known group consists of a defined population observed over a period, such as passengers on a cruise ship. When the study group is known, a sample of the population can be used as controls. If no population roster exists, then techniques such as random-digit dialling… CONTINUE READING
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