Osteoarthritis Index delivered by mobile phone (m-WOMAC) is valid, reliable and responsive

Bellamy, N., Wilson, C., Hendrikz, Joan, Whitehouse, S.L., Patel, B., Dennison, S. and Davis, T. (2011) Osteoarthritis Index delivered by mobile phone (m-WOMAC) is valid, reliable and responsive. Journal of Clinical Epidemiology, 64 2: 182-190. doi:10.1016/j.jclinepi.2010.03.013

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Author Bellamy, N.
Wilson, C.
Hendrikz, Joan
Whitehouse, S.L.
Patel, B.
Dennison, S.
Davis, T.
Title Osteoarthritis Index delivered by mobile phone (m-WOMAC) is valid, reliable and responsive
Journal name Journal of Clinical Epidemiology   Check publisher's open access policy
ISSN 0895-4356
Publication date 2011-02-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.jclinepi.2010.03.013
Volume 64
Issue 2
Start page 182
End page 190
Total pages 9
Place of publication New York, N.Y. U.S.A.
Publisher Elsevier
Language eng
Formatted abstract
To evaluate the validity, reliability, responsiveness, and mode preference of electronic data capture (EDC) using the Western Ontario and McMaster (WOMAC) numerical rating scale (NRS) 3.1 Osteoarthritis (OA) Index on Motorola V3 mobile phones.

Study Design and Setting:
Patients with OA undergoing hip or knee joint replacement were assessed preoperatively and 3-4 months postoperatively, completing the WOMAC Index in paper (p-WOMAC) and electronic (m-WOMAC) format in random order.

Data were successfully and securely transmitted from patients in Australia to a server in the United States. Pearson correlations between the summated total index scores (TISs) for the p-WOMAC and m-WOMAC pre- and postsurgery were 0.98 and 0.99 (P < 0.0001). There were no clinically important or statistically significant between-method differences in the adjusted total summated scores, pre- and postsurgery (adjusted mean differences = 4.44, P = 0.474 and 1.73, P = 0.781, respectively). Internal consistency estimates of m-WOMAC reliability were 0.87-0.98. The m-WOMAC detected clinically important, statistically significant (P < 0.0001) improvements in pain, stiffness, function, and TIS. No statistically significant differences in mode preference were detected.


There was close agreement and no significant differences between m-WOMAC and p-WOMAC scores. This study confirms the validity, reliability, and responsiveness of the Exco InTouch-engineered, Java-based m-WOMAC Index application. EDC with the m-WOMAC Index provides unique opportunities for using quantitative measurement in clinical research and practice. © 2010 Elsevier Inc. All rights reserved.
Keyword EDC
Mobile phone
Outcome measurement
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Medicine Publications
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Citation counts: TR Web of Science Citation Count  Cited 22 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 08 Dec 2010, 00:21:45 EST by Chesne McGrath on behalf of Medicine - Royal Brisbane and Women's Hospital