Rheumatology Advance Access originally published online on March 9, 2005
Rheumatology 2005 44(5):666-669; doi:10.1093/rheumatology/keh578
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Validity and reliability of an Italian version of the revised Leeds disability questionnaire for patients with ankylosing spondylitis
Fondazione Maugeri, IRCCS, Istituto Telese Terme, Rheumatology and Rehabilitation Research Unit, Telese Terme (BN), 1 University Hospital L. Sacco, Rheumatology and Internal Medicine, Milano, 2 University of Genova, Academic Rheumatology Unit, Genova, Liguria, Italy and 3 The Leeds Teaching Hospitals NHS Trust, Research and Development, Leeds, UK.
Correspondence to: E. Lubrano, Fondazione Maugeri, IRCCS, Istituto Telese Terme, Rheumatology and Rehabilitation Research Unit, Telese Terme (BN), Campania, Italy. E-mail: enniolubrano{at}hotmail.com; elubrano{at}fsm.it
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 2274, median disease duration 4.5 yr, range 124) 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
coefficient of reliability. Construct validity of the LDQ was evaluated using the correlation between the HAQ and anthropometric measurements. Testretest reliability was assessed with the intraclass correlation coefficient.
Results. All patients completed the validation study. The questionnaire was internally consistent (
=0.90). A significant correlation was recorded between the LDQ and the HAQ score (
=0.841, P<0.01) and the anthropometric measurements. Testretest 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.
KEY WORDS: Ankylosing spondylitis, Italian version, Revised Leeds Disability Questionnaire, Validation, Disability
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