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. 2024 Oct 1;63(10):2660-2669.
doi: 10.1093/rheumatology/keae162.

Factors associated with physical function among people with systemic sclerosis: a SPIN cohort cross-sectional study

Collaborators, Affiliations

Factors associated with physical function among people with systemic sclerosis: a SPIN cohort cross-sectional study

Tiffany Dal Santo et al. Rheumatology (Oxford). .

Abstract

Objectives: To compare physical function in systemic sclerosis (SSc, scleroderma) to general population normative data and identify associated factors.

Methods: Scleroderma Patient-centered Intervention Network Cohort participants completed the Physical Function domain of the Patient-Reported Outcomes Measurement Information System Version 2 upon enrolment. Multivariable linear regression was used to assess associations of sociodemographic, lifestyle, and disease-related variables.

Results: Among 2385 participants, the mean physical function T-score (43.7, SD = 8.9) was ∼2/3 of a standard deviation (SD) below the US general population (mean = 50, SD = 10). Factors associated in the multivariable analysis included older age (-0.74 points per SD years, 95% CI -0.78 to -1.08), female sex (-1.35, -2.37 to -0.34), fewer years of education (-0.41 points per SD in years, -0.75 to -0.07), being single, divorced, or widowed (-0.76, -1.48 to -0.03), smoking (-3.14, -4.42 to -1.85), alcohol consumption (0.79 points per SD drinks per week, 0.45-1.14), BMI (-1.41 points per SD, -1.75 to -1.07), diffuse subtype (-1.43, -2.23 to -0.62), gastrointestinal involvement (-2.58, -3.53 to -1.62), digital ulcers (-1.96, -2.94 to -0.98), moderate (-1.94, -2.94 to -0.93) and severe (-1.76, -3.24 to -0.28) small joint contractures, moderate (-2.10, -3.44 to -0.76) and severe (-2.54, -4.64 to -0.44) large joint contractures, interstitial lung disease (-1.52, -2.27 to -0.77), pulmonary arterial hypertension (-3.72, -4.91 to -2.52), rheumatoid arthritis (-2.10, -3.64 to -0.56) and idiopathic inflammatory myositis (-2.10, -3.63 to -0.56).

Conclusion: Physical function is impaired for many individuals with SSc and is associated with multiple disease factors.

Keywords: PROMIS-29; physical function; scleroderma; systemic sclerosis.

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Figures

Figure 1.
Figure 1.
Forest plot including mean physical function scores in months since enrolment in the SPIN Cohort. The U.S. general population mean is represented by the dotted line. Means, standard deviations, and number of participants at each assessment are shown in Supplementary Table S3, available at Rheumatology online
Figure 2.
Figure 2.
Forest plot including mean physical function scores (95% CIs) by country, disease subtype, and sex. The U.S. general population mean is represented by the dotted line
Figure 3.
Figure 3.
Bar chart including the proportion of participants with physical function scores by classification by country, disease subtype, and sex

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