Copyright information:Taken from "The Shoulder Pain and Disability Index demonstrates factor, construct and longitudinal validity"BMC Musculoskeletal Disorders 2006;7():12-12.Published online 10 Feb 2006PMCID:PMC1382226.Copyright © 2006 MacDermid et al; licensee BioMed Central Ltd.in and those who did not. Significant improvements occurred across time in both groups. Patients with a specific diagnosis had higher pain and disability at all 3 time-points (p < 0.001).
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