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Table 1 WOMAC subscales descriptive data (raw scores and Rasch transformed scores)

From: The Visual Analogue WOMAC 3.0 scale - internal validity and responsiveness of the VAS version

Raw (ordinal data): scores are divided by 2 so scores can range from 0-50

Mean

SD

Range

Wilcoxon Signed Ranks test

Standardised Response Mean

    

Z

P-value

 

Pre Pain score

27.23

8.45

5.30 to 47.40

-6.543

<0.001

0.55

Post Pain score

22.43

10.41

0 to 45.90

   

Pre Physical Functioning score

27.99

8.99

2.53 to 46.12

-5.187

<0.001

0.49

Post Physical Functioning score

24.47

9.99

2.79 to 47.62

   

Pre Stiffness score

30.66

10.6

1.50 to 49.75

-4.531

<0.001

0.43

Post Stiffness score

27.08

11.45

0.25 to 47.25

   

Rasch transformed (interval data): the unit is in logits

Mean

SD

Range

Paired t-test

Standardised Response Mean

    

Z

P-value

 

Pre Pain score

0.069

0.177

-0.503 to 1.010

4.802

<0.001

0.35

Post Pain score

-0.051

0.348

-4.410 to 0.510

   

Pre Physical Functioning score

0.043

0.168

-0.717 to 0.631

4.465

<0.001

0.37

Post Physical Functioning score

-0.01

0.181

-0.740 to 0.850

   

Pre Stiffness score

0.121

0.305

-0.905 to 1.971

4.627

<0.001

0.34

Post Stiffness score

0.026

0.297

-1.446 to 0.939

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