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Table 2 Content validity. The percentage of patients reporting the importance of the five different koos subscales when deciding to have the operation

From: Knee injury and Osteoarthritis Outcome Score (KOOS) – validation and comparison to the WOMAC in total knee replacement

  Pain Symptoms ADL Sport/Rec QOL
Extremely or very important 95% 92% 93% 51% 91%
Somewhat or not important at all 5% 8% 7% 49% 9%