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Commentary

SK Campbell, PhD, PT, FAPTA, is Professor, Department of Physical Therapy, University of Illinois at Chicago, College of Associated Health Professions, 1919 W Taylor St, Chicago, IL 60612

This excerpt was created in the absence of an abstract.

I would like to congratulate the authors of this article for pointing out that the validity of physical therapy measurements is in need of careful scrutiny. Sim and Arnell have drawn careful distinctions between reliability and validity. On close inspection, however, these concepts are highly interrelated, and each can affect the other. The authors have made the point that it is not possible to have a highly valid measure if reliability is low. On the other hand, it is also possible for the calculated reliability of a measure to be affected by problems with validity when systematic error is operating.¹

The internal consistency coefficient—the definition of reliability in classical test theory—presents a second example of the close relationship of these concepts....

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Measurement Validity in Physical Therapy Research

Julius Sim and Peggy Arnell
Physical Therapy 1993 73: 102-110. [Abstract] [PDF]