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Rheumatology Advance Access published online on March 9, 2005
Rheumatology, doi:10.1093/rheumatology/keh578
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© The Author 2005. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received December 16, 2004
Accepted January 14, 2005

Concise Report

Validity and reliability of an Italian version of the revised Leeds disability questionnaire for patients with ankylosing spondylitis

E. Lubrano 1*, P. Sarzi Puttini 2, W. J. Parsons 3, S. D'Angelo 1, M. A. Cimmino 4, F. Serino 1, and N. Pappone 1

1 Fondazione Maugeri, IRCCS, Istituto Telese Terme, Rheumatology and Rehabilitation Research Unit, Telese Terme (BN), Italy
2 University Hospital L. Sacco, Rheumatology and Internal Medicine, Milano, Italy
3 The Leeds Teaching Hospitals NHS Trust, Research and Development, Leeds, UK
4 University of Genova, Academic Rheumatology Unit, Genova, Liguria, Italy

* To whom correspondence should be addressed.
E. Lubrano, E-mail: enniolubrano{at}hotmail.com


  Abstract

Objective. The purpose of the present study was to produce an Italian version of the Revised Leeds Disability Questionnaire (LDQ) in a group of patients with ankylosing spondylitis, and to examine the psychometric properties of this version, evaluating its internal consistency, external validity and reliability.

Methods. The LDQ was administered to 60 Caucasian patients affected by ankylosing spondylitis (50 males, 10 females, mean age 46.1 ± 14.2 yr, range 22-74, median disease duration 4.5 yr, range 1-24) together with the Italian version of the Stanford Health Assessment Questionnaire (HAQ), and anthropometric measurements. Thirty patients completed the questionnaire after a 10-day interval. Internal consistency was evaluated with Cronbach's {alpha} coefficient of reliability. Construct validity of the LDQ was evaluated using the correlation between the HAQ and anthropometric measurements. Test-retest reliability was assessed with the intraclass correlation coefficient.

Results. All patients completed the validation study. The questionnaire was internally consistent ({alpha} = 0.90). A significant correlation was recorded between the LDQ and the HAQ score ({rho} = 0.841, P<0.01) and the anthropometric measurements. Test-retest reliability showed a good correlation coefficient (intraclass correlation = 0.97).

Conclusion. The Italian LDQ is a valid and reliable instrument for detecting and measuring functional disability in patients with ankylosing spondylitis. Our results confirm the utility of this questionnaire as a valid and feasible functional measure for patients with ankylosing spondylitis.

Keywords: Ankylosing spondylitis; Italian version; Revised Leeds Disability Questionnaire; Validation; Disability.
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