In a study of liver transplant recipients, the researcher specifies that the subjects must be 18 years of age or older and the recipient of only one liver transplant. These criteria are an example of:

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Inclusion criteria are those characteristics that the subject or element must possess to be part of the target population.
Demographic attributes are things about the sample that the researcher describes in the report about the sample.
Exclusion criteria are characteristics that the researcher does not want in the elements or subjects of the study.
Identification of characteristics and a homogeneous group would eliminate a characteristic as a variable of any kind. If the characteristic is controlled, it is not an extraneous variable.

In a Study of Liver Transplant Recipients, the Researcher Specifies