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Table 4 Raw score to interval scale conversion table for the scales

From: Validation of the Neurological Fatigue Index for stroke (NFI-Stroke)

Raw Summary Physical Cognitive
Score Scale Scale Scale
0 0.00 0.00 0.00
1 2.34 1.97 1.46
2 4.05 3.43 2.69
3 5.29 4.51 3.73
4 6.31 5.42 4.70
5 7.22 6.24 5.60
6 8.05 7.00 6.43
7 8.83 7.73 7.21
8 9.59 8.45 7.98
9 10.32 9.16 8.78
10 11.05 9.88 9.65
11 11.77 10.61 10.71
12 12.49 11.35 12.00
13 13.22 12.13  
14 13.96 12.94  
15 14.70 13.78  
16 15.46 14.65  
17 16.24 15.53  
18 17.03 16.41  
19 17.83 17.29  
20 18.64 18.21  
21 19.44 19.21  
22 20.25 20.38  
23 21.06 21.93  
24 21.89 24.00  
25 22.75   
26 23.67   
27 24.71   
28 25.95   
29 27.66   
30 30.00   
  1. N.B. The conversions only remain valid if there are no missing data. The transformation can only occur when data are complete because, for example, a score of say 6 from complete data is not the same as a score of 6 from incomplete data. The latter is likely to represent a higher level of the attribute being measured.