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The Journal of Bone and Joint Surgery (American) 84:208-215 (2002)
© 2002 The Journal of Bone and Joint Surgery, Inc.


Scientific Article

The American Academy of Orthopaedic Surgeons Outcomes Instruments

Normative Values from the General Population

Frank G. Hunsaker, PhD, Dominic A. Cioffi, MA, Peter C. Amadio, MD, James G. Wright, MD and Beth Caughlin, MS

Investigation performed at the National Research Corporation, Lincoln, Nebraska

Frank G. Hunsaker, PhD
National Research Corporation, 1245 Q Street, Suite 400, Lincoln, NE 68508. E-mail address: fhunsaker{at}nationalresearch.com

Dominic A. Cioffi, MA
Cooper Research, 8150 Corporate Park Drive, Cincinnati, OH 45242

Peter C. Amadio, MD
Departments of Health Science Research and Orthopedic Surgery, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905

James G. Wright, MD
Division of Orthopedic Surgery, Hospital for Sick Children, 555 University Avenue, Room S-107, Toronto, ON M5G 1X8, Canada

Beth Caughlin, MS
Experian, 901 West Bond Street, Lincoln, NE 68521-3694

In support of their research or preparation of this manuscript, one of the authors received a grant or outside funding from the Canadian Institutes of Health Research. None of the authors received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Background: The collection of population-based normative data is a necessary step in the process of standardization of eleven American Academy of Orthopaedic Surgeons (AAOS) musculoskeletal outcomes measures. These data serve as comparative normative scores with which to assess the effectiveness of treatment regimens in clinical practice settings and to study the clinical outcomes of treatment in musculoskeletal research.

Methods: With use of a panel mail methodology, self-reported data on the eleven AAOS musculoskeletal outcomes measures were collected from the general population of the United States.

Results: The overall response rate of 67.4% for the various surveys met study expectations. For the eleven measures, the range of the confidence intervals for the surveys was ±1.6% to ±2.3%, exceeding the ±3% set a priori. With use of the Multitrait/Multi-Item Analysis Program, all of the scales within each of eleven measures exhibited high internal reliability as well as discriminant and convergent validity. Items within each of the scales contributed roughly equal proportions of information to the total scale scores.

Conclusions: All eleven instruments met study expectations for providing reliable and valid normative data for use in clinical and research settings.


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