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Table 5 Conversion table for raw to interval scores.

From: Development of a patient reported outcome measure for fatigue in motor neurone disease: the Neurological Fatigue Index (NFI-MND)

Raw Score

Summary Scale

Weakness Subscale

Energy Subscale

0

0.00

0.00

0.00

1

2.05

1.88

1.53

2

3.56

3.29

2.79

3

4.66

4.35

3.83

4

5.59

5.24

4.80

5

6.41

6.04

5.75

6

7.17

6.78

6.70

7

7.90

7.50

7.61

8

8.62

8.20

8.48

9

9.34

8.91

9.31

10

10.07

9.63

10.14

11

10.81

10.36

10.97

12

11.58

11.13

11.81

13

12.36

11.91

12.63

14

13.16

12.73

13.45

15

13.98

13.58

14.29

16

14.80

14.47

15.24

17

15.62

15.41

16.45

18

16.44

16.43

18.00

19

17.28

17.59

 

20

18.17

19.08

 

21

19.16

21.00

 

22

20.32

  

23

21.89

  

24

24.00

  
  1. Table 5 may be used to translate raw total scores taken from the questionnaires into interval level scores suitable for use in mathematic operations. NB: Only valid with complete data.