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.