The patient-specific functional scale: validity, reliability, and responsiveness in patients with upper extremity musculoskeletal problems

The Journal of Orthopaedic and Sports Physical Therapy
Cheryl HeffordG David Baxter

Abstract

Clinical measurement, longitudinal; multicenter prospective cohort study. To examine the validity, reliability, and responsiveness of the Patient-Specific Functional Scale (PSFS) in patients with musculoskeletal upper extremity problems being treated in physical therapy. The clinimetric properties of the PSFS have not been established nor compared with region-specific outcome measures in patients with upper extremity problems. Patients completed the PSFS, Upper Extremity Functional Index (UEFI), and numeric pain rating scale (NPRS) at baseline and follow-up, and were categorized as improved, stable, or worsened, using the global rating of change. Construct validity was assessed by comparing the change scores of the stable and improved groups, using independent-samples t tests. Reliability was evaluated using intraclass correlation coefficient (ICC2,1) with 95% confidence intervals. Bland-Altman plots determined limits of agreement. Responsiveness and minimal important difference (MID) were determined with receiver operator characteristic (ROC) curves. One hundred eighty patients met the inclusion criteria. Construct validity was supported for the PSFS and the UEFI (P<.001). Reliability was moderate to good for the PSFS (ICC2,1 ...Continue Reading

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