RESEARCH - Prevalence and predictors of disability in valued life activites among individuals with RA

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Ann Rheum Dis. 2005 Oct 25; [Epub ahead of print]

Prevalence and Predictors of Disability in Valued Life Activities among

Individuals with Rheumatoid Arthritis.

Katz P, A, Yelin E.

University of California, San Francisco, United States.

OBJECTIVES: Identify the prevalence of disability in wide range of life

activities and identify factors associated with such disability using the

Verbrugge and Jette disablement model as a framework. METHODS: Data were

from a panel study of 548 individuals with rheumatoid arthritis (RA)

interviewed annually by telephone. Valued life activity (VLA) disability was

assessed using a 26-item scale rating difficulty performing each activity.

Three types of summary measures were calculated: activities unable to

perform, activities affected, and mean difficulty. Subscale scores were also

calculated corresponding to obligatory, committed, and discretionary

activities, as defined in the disablement model. Disease status measures

were examined as predictors of VLA disability using multiple regression

analyses. RESULTS: Half of subjects were unable to perform at least one VLA.

Approximately 2%, 31.3%, and 40.2% were unable to perform at least one

obligatory, committed, and discretionary activity, respectively. Almost all

(95%) individuals reported at least one VLA affected by RA; 68.4%, 91.4%,

and 92.5% reported at least one obligatory, committed, and discretionary

activity, respectively, affected. Disease status measures were robust

predictors of VLA disability, accounting for 22%-47% of the variation in VLA

disability (with one exception). Adding HAQ to these models significantly

increased (p<.0001) all model R2's. HAQ score mediated the effects of many

disease measures, consistent with the disablement model.

CONCLUSION: VLA disability was common, with more disability noted in

committed and discretionary than obligatory activities. Because VLA

disability has been linked to psychological well-being in previous studies,

identification of factors that may protect against such disability is

important.

PMID: 16249225

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve & db=PubMed & list_uids=1\

6249225 & dopt=Abstract

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