Matching
A sampling method to ensure that the two groups to be compared have similar characteristics. In an intervention study, pairs of similar “matched” subjects are formed and then one member of the pair is randomly assigned to one group and the other member to the other group. In a case-control study: choosing one or more controls with particular matching attributes for each case. Researchers match cases and controls according to particular variables that are thought to be important, such as age and sex.
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