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Validation for the reduced Western Ontario McMaster Universities Osteoarthritis Index function scale

By Sarah L. Whitehouse, Ian D. Learmonth and Ross W. Crawford

Abstract

Aim\ud \ud The reduced WOMAC function scale has been developed and initial validity performed. However, further validation and recommendations for the treatment of missing values are required \ud \ud Method\ud \ud A cross-over study of 100 pre-operative TKA patients was performed for further validation. Repeatability testing was performed for full and reduced WOMAC scores. Missing value protocols were developed, examining number of valid responses, means and SDs.\ud \ud Results\ud \ud Cross-over: There was no significant difference between full and reduced scales.\ud Test-retest: There was no significant difference between scores for either the full or reduced scales. \ud Missing values: The frequencies of valid responses, means and SDs when using different missing value protocols (none missing, 0-1, upto 2 and upto 3 missing), indicated that the 1 or 2 missing protocol was optimal.\ud \ud Conclusions\ud \ud The reduced WOMAC function scale has been further validated. It is proposed that where 1 or 2 items are missing, the average value for the sub-scale is substituted in lieu of these missing values

Topics: 110314 Orthopaedics, Reduced WOMAC, missing values, validation, outcome total joint replacement
Publisher: Hong Kong Academy of Medicine Press
Year: 2008
OAI identifier: oai:eprints.qut.edu.au:13400

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