Table 2– Fatigue Assessment Scale (FAS) with instructions
NeverSometimesRegularlyOftenAlways
1) I am bothered by fatigue12345
2) I get tired very quickly12345
3) I don’t do much during the day12345
4) I have enough energy for everyday life12345
5) Physically, I feel exhausted12345
6) I have problems to start things12345
7) I have problems to think clearly12345
8) I feel no desire to do anything12345
9) Mentally, I feel exhausted12345
10) When I am doing something, I can concentrate quite well12345
  • Per statement, one out of five answer categories can be chosen, from never to always. 1: never; 2: sometimes (about monthly or less); 3: regularly (about a few times a month); 4: often (about weekly); 5: always (about every day). An answer to each question has to be given, even if the person does not have any complaints at the moment. Scores on questions 4 and 10 should be recoded (1=5, 2=4, 3=3, 4=2, 5=1). Subsequently, the total FAS score can be calculated by summing the scores on all questions (the recoded scores for question 4 and 10). The sum of questions 3 and 6–9 indicates mental fatigue, and the sum of the questions 1, 2, 4, 5 and 10 indicates physical fatigue. The minimal score is 10 the maximal score is 50. Based on large representative samples of the Dutch population, the cut-off score of the FAS is 21, i.e. scores of ≥22 are considered to represent substantial fatigue. A change in the FAS score of four points is considered to be clinically relevant (minimal clinically important different) [37]. The FAS has been validated in Croatian, Danish, Dutch, English, French, German, Italian, Japanese, Norwegian, Romanian, Russian and Spanish. A PDF and digital version of the English FAS can be found at the website of the ild care foundation [38]. More information can be provided by the corresponding author. Reproduced and modified from [38] with the permission of the ild care foundation (www.ildcare.eu).