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A computer-adaptive disability instrument for lower extremity osteoarthritis research demonstrated promising breadth, precision, and reliability.

Jette, Alan M; McDonough, Christine M; Haley, Stephen M; Ni, Pengsheng; Olarsch, Sippy; Latham, Nancy; Hambleton, Ronald K; Felson, David; Kim, Young-Jo; Hunter, David

Journal of clinical epidemiology. 2009;62(8):807-15.

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Abstract

OBJECTIVE: To develop and evaluate a prototype measure (OA-DISABILITY-CAT) for osteoarthritis research using item response theory (IRT) and computer-adaptive test (CAT) methodologies. STUDY DESIGN AND SETTING: We constructed an item bank consisting of 33 activities commonly affected by lower extremity (LE) osteoarthritis. A sample of 323 adults with LE osteoarthritis reported their degree of limitation in performing everyday activities, and completed the Health Assessment Questionnaire-II (HAQ-II). We used confirmatory factor analyses to assess scale unidimensionality and IRT methods to calibrate the items and examine the fit of the data. Using CAT simulation analyses, we examined the performance of OA-DISABILITY-CATs of different lengths compared with the full-item bank and the HAQ-II. RESULTS: One distinct disability domain was identified. The 10-item OA-DISABILITY-CAT demonstrated a high degree of accuracy compared with the full-item bank (r=0.99). The item bank and the HAQ-II scales covered a similar estimated scoring range. In terms of reliability, 95% of OA-DISABILITY reliability estimates were over 0.83 vs. 0.60 for the HAQ-II. Except at the highest scores, the 10-item OA-DISABILITY-CAT demonstrated superior precision to the HAQ-II. CONCLUSION: The prototype OA-DISABILITY-CAT demonstrated promising measurement properties compared with the HAQ-II, and is recommended for use in LE osteoarthritis research.

Bibliographic metadata

Content type:
Publication type:
Publication form:
Published date:
Language:
eng
Abbreviated journal title:
ISSN:
Place of publication:
United States
Volume:
62
Issue:
8
Pagination:
807-15
Digital Object Identifier:
10.1016/j.jclinepi.2008.10.004
Pubmed Identifier:
19216052
Pii Identifier:
S0895-4356(08)00294-1
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:67656
Created by:
Ingram, Mary
Created:
22nd October, 2009, 10:15:37
Last modified by:
Ingram, Mary
Last modified:
23rd August, 2012, 21:37:17

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