Table 1 Subscales and items within the MFI-20

General fatigue

1

I feel fit

5

I feel tired

12

I am rested

16

I tire easily

Physical fatigue

2

Physically I feel only able to do a little

8

Physically I can take on a lot

14

Physically I feel I am in a bad condition

20

Physically I feel I am in an excellent condition

Mental fatigue

7

When I am doing something, I can keep my thought on it

11

I can concentrate well

13

It takes a lot of effort to concentrate on things

19

My thoughts easily wander

Reduced activity

3

I feel very active

6

I think I do a lot in a day

10

I think I do very little in a day

17

I get little done

Reduced motivation

4

I feel like doing all sorts of nice things

9

I dread having to do things

15

I have a lot of plans

18

I don’t feel like doing anything