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Table 3 Transformation of Raw score to Interval metric

From: Measure of activity performance of the hand (MAP-Hand) questionnaire: linguistic validation, cultural adaptation and psychometric testing in people with rheumatoid arthritis in the UK

0 0.0
1 4.9
2 8.4
3 10.9
4 12.9
5 14.6
6 16.1
7 17.5
8 18.8
9 20.1
10 21.4
11 22.6
12 23.7
13 24.9
14 26.0
15 27.0
16 28.0
17 29.0
18 29.9
19 30.8
20 31.7
21 32.5
22 33.3
23 34.1
24 34.8
25 35.5
26 36.2
27 36.8
28 37.4
29 38.0
30 38.6
31 39.1
32 39.6
33 40.1
34 40.6
35 41.0
36 41.5
37 41.9
38 42.2
39 42.6
40 43.0
41 43.3
42 43.6
43 44.0
44 44.3
45 44.7
46 45.1
47 45.5
48 46.0
49 46.6
50 47.3
51 48.1
52 49.3
53 51.1
54 54.0