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Table 1 Raw score to interval scale Rasch Metric for DASH and QUICKDASH

From: Revisiting the disabilities of the arm, shoulder and hand (DASH) and QuickDASH in rheumatoid arthritis

DASH Raw

DASH

DASH

QuickDASH Raw

QuickDASH

DASH

(0–4)

Standard

Rasch

(0–4)

Standard

Rasch

0

0.0

0.0

0

0.0

0.0

1

0.8

5.5

1

2.3

6.4

2

1.7

9.1

2

4.5

11.5

3

2.5

11.5

3

6.8

15.6

4

3.3

13.3

4

9.1

19.4

5

4.2

14.9

5

11.4

23.0

6

5.0

16.3

6

13.6

26.4

7

5.8

17.6

7

15.9

29.6

8

6.7

18.9

8

18.2

32.7

9

7.5

20.1

9

20.5

35.5

10

8.3

21.3

10

22.7

38.2

11

9.2

22.5

11

25.0

40.7

12

10.0

23.6

12

27.3

43.0

13

10.8

24.7

13

29.5

45.2

14

11.7

25.8

14

31.8

47.3

15

12.5

26.8

15

34.1

49.2

16

13.3

27.9

16

36.4

51.0

17

14.2

28.9

17

38.6

52.8

18

15.0

29.9

18

40.9

54.4

19

15.8

30.8

19

43.2

55.9

20

16.7

31.8

20

45.5

57.4

21

17.5

32.7

21

47.7

58.8

22

18.3

33.6

22

50.0

60.1

23

19.2

34.5

23

52.3

61.4

24

20.0

35.4

24

54.5

62.7

25

20.8

36.2

25

56.8

63.9

26

21.7

37.0

26

59.1

65.1

27

22.5

37.8

27

61.4

66.4

28

23.3

38.6

28

63.6

67.6

29

24.2

39.4

29

65.9

68.9

30

25.0

40.2

30

68.2

70.1

31

25.8

40.9

31

70.5

71.4

32

26.7

41.6

32

72.7

72.8

33

27.5

42.3

33

75.0

74.3

34

28.3

43.0

34

77.3

75.8

35

29.2

43.7

35

79.5

77.3

36

30.0

44.3

36

81.8

79.0

37

30.8

45.0

37

84.1

80.7

38

31.7

45.6

38

86.4

82.6

39

32.5

46.2

39

88.6

84.5

40

33.3

46.8

40

90.9

86.6

41

34.2

47.4

41

93.2

88.9

42

35.0

48.0

42

95.5

91.5

43

35.8

48.6

43

97.7

95.1

44

36.7

49.1

44

100.0

100.0

45

37.5

49.7

   

46

38.3

50.2

   

47

39.2

50.7

   

48

40.0

51.3

   

49

40.8

51.8

   

50

41.7

52.3

   

51

42.5

52.8

   

52

43.3

53.2

   

53

44.2

53.7

   

54

45.0

54.2

   

55

45.8

54.7

   

56

46.7

55.1

   

57

47.5

55.6

   

58

48.3

56.0

   

59

49.2

56.5

   

60

50.0

56.9

   

61

50.8

57.3

   

62

51.7

57.8

   

63

52.5

58.2

   

64

53.3

58.6

   

65

54.2

59.1

   

66

55.0

59.5

   

67

55.8

59.9

   

68

56.7

60.3

   

69

57.5

60.7

   

70

58.3

61.2

   

71

59.2

61.6

   

72

60.0

62.0

   

73

60.8

62.4

   

74

61.7

62.9

   

75

62.5

63.3

   

76

63.3

63.7

   

77

64.2

64.1

   

78

65.0

64.6

   

79

65.8

65.0

   

80

66.7

65.5

   

81

67.5

65.9

   

82

68.3

66.3

   

83

69.2

66.8

   

84

70.0

67.3

   

85

70.8

67.7

   

86

71.7

68.2

   

87

72.5

68.7

   

88

73.3

69.2

   

89

74.2

69.6

   

90

75.0

70.2

   

91

75.8

70.7

   

92

76.7

71.2

   

93

77.5

71.7

   

94

78.3

72.2

   

95

79.2

72.8

   

96

80.0

73.3

   

97

80.8

73.9

   

98

81.7

74.5

   

99

82.5

75.1

   

100

83.3

75.7

   

101

84.2

76.3

   

102

85.0

76.9

   

103

85.8

77.6

   

104

86.7

78.2

   

105

87.5

78.9

   

106

88.3

79.6

   

107

89.2

80.3

   

108

90.0

81.0

   

109

90.8

81.8

   

110

91.7

82.5

   

111

92.5

83.3

   

112

93.3

84.1

   

113

94.2

85.0

   

114

95.0

86.0

   

115

95.8

87.1

   

116

96.7

88.3

   

117

97.5

89.8

   

118

98.3

91.8

   

119

99.2

95.0

   

120

100.0

100.0