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V

Validity

The degree to which a result (of a measurement or study) is likely to be true and free of bias (systematic errors).

The Cochrane Collaboration. (2010). Glossary. Retrieved from http://www.cochrane.org/glossary/.

Variable

An attribute of a person or object that varies, that is, takes on different values (e.g. body temperature, age, heart rate).

Polit, D. F., & Hungler, B. P. (1999). Nursing Research: Principles and Methods (6th ed.). Philadelphia: Lippincott.