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The primary outcome KOOS4, for all individuals in the 2-year dataset at baseline and at 2 years
The KOOS4 is a composite score calculated from a patient-reported outcome measure, from 0 (extreme knee symptoms) to 100 (no knee symptoms). KOOS4=Knee Injury and Osteoarthritis Outcome Score based on a composite of four subscales (pain, symptoms, sports and recreation, and quality of life).
