Encyclopedia of Public Health

2008 Edition
| Editors: Wilhelm Kirch


Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-5614-7_3019


Restriction is straightforward, convenient and inexpensive means to control confounding. It is a process of limiting the entrance into the study to individuals who fall within a specified category of a confounder. For example if sex is potential confounder, the study could include only men or only women. Similarly, control of age could be achieved by restricting admissibility to those within o narrow range that corresponds to a relatively homogeneous rate of disease incidence.

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© Springer-Verlag 2008