Kevin is a member of the Nursing Research Council of the hospital. His first assignment is to determine the level of patient satisfaction on the care they received from the hospital. He plans to include all adult patients admitted from April to May, with average length of stay of 3-4 days, first admission, and with no complications. Which of the following is an extraneous variable of the study?
A. Date of admission
B. Length of stay
C. Age of patients
D. Absence of complications
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