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Table 3 Transformation Matrix for Converting Raw Ordinal Level Scores to Interval-level Scores, Using the Revised Scoring Where the Scale is Out of a Maximum of 10 Points. This conversion can be used only with the modified PRWE questionnaire

From: Rasch analysis of the patient-rated wrist evaluation questionnaire

ROW SCORE (ORDINAL)

LOGIT LOCATION

INTERVAL-LEVEL SCORE

0

−5.49

0.06

1

−4.49

4.34

2

−3.79

7.38

3

−3.30

9.50

4

−2.91

11.18

5

−2.58

12.60

6

−2.28

13.86

7

−2.01

15.03

8

−1.76

16.11

9

−1.53

17.13

10

−1.30

18.09

11

−1.09

18.99

12

−0.90

19.84

13

−0.71

20.64

14

−0.54

21.38

15

−0.37

22.09

16

−0.22

22.75

17

−0.08

23.37

18

0.05

23.95

19

0.18

24.50

20

0.30

25.02

21

0.41

25.52

22

0.52

26.00

23

0.63

26.46

24

0.73

26.91

25

0.84

27.35

26

0.94

27.79

27

1.04

28.23

28

1.15

28.68

29

1.25

29.14

30

1.36

29.62

31

1.48

30.13

32

1.60

30.65

33

1.73

31.22

34

1.87

31.82

35

2.03

32.48

36

2.19

33.20

37

2.38

34.02

38

2.61

34.97

39

2.88

36.15

40

3.24

37.69