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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.