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|Title: ||The Development of a Short Measure of Physical Function for Hip OA. HOOS- Physical Function Short-form (HOOS-PS) – An OARSI/OMERACT Initiative|
|Authors: ||Davis, AM|
|Keywords: ||Osteoarthritis, Physical function, Outcome measure, Rasch analysis|
|Issue Date: ||2008|
|Publisher: ||Osteoarthritis and Cartilage|
|Citation: ||Osteoarthritis and Cartilage, 2008; 16:551-559|
|Abstract: ||Objective: To derive a cross-culturally valid, short measure of physical function using function subscales (daily living and sports and recreation)
of the Hip disability and Osteoarthritis Outcome Score (HOOS).
Methods: Rasch analysis was conducted on data from individuals from multiple countries who had hip osteoarthritis (OA). Fit of the data to the
Rasch model was evaluated by model c2 and item fit statistics (c2, size of residual, and F-test). Differential item functioning was evaluated by
gender, age and country. Unidimensionality was evaluated by factor analysis of residuals. Individual data sets were analyzed and data pooled
and re-analyzed for fit to the model. Regression modeling was conducted to derive a nomogram converting raw summed scores to Rasch
derived interval scores.
Results: Seven data sets were included (n ¼ 2991), ages 19e96 years, male/female ratio was 1:1.23. The final model included five HOOS
items. From the easiest to most difficult, the items (logit) were as follows: sitting (1.832), descending stairs (0.729), getting in/out of bath or
shower (0.255), twisting/pivoting on loaded leg ( 0.221) and running ( 2.595). The separation index was 0.80.|
|Appears in Collections:||UofT Faculty publications|
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