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Table 5 Effect sizes and Standardized Response Mean (SRM) 6 and 12 months post-operatively

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

Subscale Effect Size 6 months Effect Size 12 months SRM 6 months SRM 12 months
KOOS Pain 2.28 2.55 1.67 2.12
WOMAC Pain 2.08 2.27 1.77 2.02
SF-36 Bodily Pain 2.10 2.28 1.31 1.51
KOOS Symptoms 1.24 1.59 0.99 1.25
WOMAC Stiffness 1.30 1.65 0.92 1.20
KOOS ADL 2.25 2.56 1.70 1.90
KOOS Sport/Rec* 1.18 1.08 0.81 0.88
WOMAC Function 2.25 2.56 1.70 1.90
SF-36 physical function 2.01 2.23 1.39 1.54
KOOS QOL 2.86 3.54 1.60 1.99
  1. *For the subscale Sport/Rec, 29 subjects and 27 subjects, respectively, were used for the calculations at 6 and 12 months.