Table 2. FAS-e items reliability results, floor and ceiling effects, means (M) and standard deviation (SD).

Item	n	Corrected item-total correlaction	Crombach’s Alpha if item deleted	Floor (“1” %)	Ceiling (“5” %)	M	SD
1. I am worried about fatigue.	852	0.425	0.79	42.0	1.3	1.76	0.81
2. I get tired very quickly.	857	0.593	0.78	36.9	1.1	1.85	0.85
3. I don’t do much during the day.	827	0.411	0.80	40.9	2.9	1.94	1.01
4. I have enough energy for everyday life.a	854	0.415	0.80	22.8	5.2	2.72	1.21
5. Physically, I feel exhausted.	852	0.534	0.78	22.2	2.1	2.05	0.78
6. I have problems starting things.	847	0.572	0.78	54.5	1.1	1.59	0.78
7. I have problems thinking clearly.	849	0.571	0.78	64.2	0.9	1.47	0.74
8. I feel no desire to do anything.	847	0.603	0.78	51.2	0.9	1.61	0.76
9. Mentally, I feel exhausted.	849	0.612	0.77	49.7	0.9	1.68	0.84
10. When I am doing something, I can concentrate quite  well.a	849	0.316	0.82	29.1	6.4	2.61	1.30

Notes.

^aItems #4 and #10 have been reverted before carrying all computations.