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  • Title: An examination of work instability, functional impairment, and disease activity in employed patients with rheumatoid arthritis.
    Author: Macedo A, Oakley S, Gullick N, Kirkham B.
    Journal: J Rheumatol; 2009 Feb; 36(2):225-30. PubMed ID: 19208557.
    Abstract:
    OBJECTIVE: To evaluate the relationship between the Disease Activity Score 28-joint count (DAS28), Health Assessment Questionnaire (HAQ), and Rheumatoid Arthritis-Work Instability Scale (RAWIS); and to define thresholds for clinical assessments associated with moderate to high RA-WIS. METHODS: Employed patients with RA were evaluated using DAS28, HAQ, and RA-WIS during routine clinics. Relationships between these assessments were evaluated by simple correlation. Multiple linear regression modeling was performed using RA-WIS as an outcome variable and HAQ, DAS28, age, sex, occupation, and disease duration as input variables. Receiver-operating characteristic curves were then formulated to determine optimal DAS28, and HAQ cutoff points for RA-WIS >or= 10, along with the odds ratio (OR). RESULTS: Ninety patients with RA completed the RA-WIS, which was moderately correlated with DAS28 (r =0.53) and HAQ (r = 0.66). Fifty-four percent of RA-WIS was explained by DAS28 (p = 0.002), HAQ (p = 0.001), and sex (p = 0.04). A DAS28 of 3.81 and HAQ of 0.55 were clinically important thresholds. High DAS28 and HAQ were associated with high RA-WIS (OR(DAS) 14.17, OR(HAQ) 25.13, OR(DAS+HAQ) 29.9). CONCLUSION: Functional impairment and disease activity significantly and independently contributed to patient-perceived work instability risk.
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