Validity reliability4/6/2023 ![]() Increasingly, investigators use the term “validation” in labeling their studies. Study design and methodology are essential considerations when assessing a study’s validity. The unambiguous term “reproducible” is preferred when discussing data consistency. The role of psychometric modeling in plastic surgery is unclear, and this discipline introduces difficult jargon that can discourage investigators. Outcome measures in plastic surgery are intended to be surveys, not tests. Reliability (both the reliability of the data and the consistency of measurements) is a prerequisite for validity. In psychometrics, its meaning is synonymous with “reproducible.” The definitions of valid and reliable are analogous to accuracy and precision. Similarly, the word “reliable” is subject to interpretation. It is a relative term most credibly assigned by the independent user. ![]() ![]() ![]() Validity is not an intrinsic test property. Studies by other investigators may be labeled “not validated.” Validity simply refers to the ability of a device to measure what it intends to measure. Study titles increasingly include the word “valid” to support the authors’ claims. This report examines the meaning of validity and reliability and the role of psychometrics in plastic surgery.
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