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Evaluation of the late life disability instrument in the lifestyle interventions and independence for elders pilot (LIFE-P) study

Hsu, FC and Rejeski, WJ and Ip, EH and Katula, JA and Fielding, R and Jette, AM and Studenski, SA and Blair, SN and Miller, ME (2010) Evaluation of the late life disability instrument in the lifestyle interventions and independence for elders pilot (LIFE-P) study. Health and Quality of Life Outcomes, 8.

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Abstract

Background: The late life disability instrument (LLDI) was developed to assess limitations in instrumental and management roles using a small and restricted sample. In this paper we examine the measurement properties of the LLDI using data from the Lifestyle Interventions and Independence for Elders Pilot (LIFE-P) study.Methods: LIFE-P participants, aged 70-89 years, were at elevated risk of disability. The 424 participants were enrolled at the Cooper Institute, Stanford University, University of Pittsburgh, and Wake Forest University. Physical activity and successful aging health education interventions were compared after 12-months of follow-up. Using factor analysis, we determined whether the LLDI's factor structure was comparable with that reported previously. We further examined how each item related to measured disability using item response theory (IRT).Results: The factor structure for the limitation domain within the LLDI in the LIFE-P study did not corroborate previous findings. However, the factor structure using the abbreviated version was supported. Social and personal role factors were identified. IRT analysis revealed that each item in the social role factor provided a similar level of information, whereas the items in the personal role factor tended to provide different levels of information.Conclusions: Within the context of community-based clinical intervention research in aged populations, an abbreviated version of the LLDI performed better than the full 16-item version. In addition, the personal subscale would benefit from additional research using IRT.Trial registration: The protocol of LIFE-P is consistent with the principles of the Declaration of Helsinki and is registered at http://www.ClinicalTrials.gov (registration # NCT00116194). © 2010 Hsu et al; licensee BioMed Central Ltd.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Hsu, FC
Rejeski, WJ
Ip, EH
Katula, JA
Fielding, R
Jette, AM
Studenski, SA
Blair, SN
Miller, ME
Date: 6 October 2010
Date Type: Publication
Journal or Publication Title: Health and Quality of Life Outcomes
Volume: 8
DOI or Unique Handle: 10.1186/1477-7525-8-115
Schools and Programs: School of Medicine > Medicine
Refereed: Yes
Date Deposited: 12 Dec 2012 21:21
Last Modified: 20 Dec 2018 00:55
URI: http://d-scholarship.pitt.edu/id/eprint/16862

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