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Table 3 Construct validity. Spearman's correlation coefficients (rS) determined when comparing KOOS' five subscales to the SF-36 eight different subscales. N = 103-105 with the exception of Sport/Rec where n = 58.

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

SF-36 subscale Physical Health† Mental Health† KOOS Pain KOOS Symptoms KOOS ADL KOOS Sport/Rec KOOS QOL
Physical Function Strong Weak 0.19 0.20* 0.48*** 0.11 0.34***
Role Physical Strong Weak 0.16 0.06 0.26** -0.06 0.10
Bodily Pain Strong Weak 0.62*** 0.37*** 0.68*** 0.34* 0.60***
General Health Moderate Moderate 0.16 0.08 0.29** -0.1 0.07
Vitality Moderate Moderate 0.38*** 0.30** 0.50*** 0.24 0.33***
Social Functioning Moderate Strong 0.26** 0.14 0.39*** 0.12 0.40***
Role Emotional Weak Strong 0.12 0.09 0.36*** 0.24 0.06
Mental Health Weak Strong 0.14 0.05 0.28** 0.09 0.10
  1. † SF-36 subscales ability to measure physical health vs. mental health [17]