Table 2.

Relevance Index values (mean participant ranking) for items from the Patient Reported Outcomes Information System (PROMIS) Fatigue Item Bank

PROMIS Item Name	Item Content	Relevance Index
FATEXP6	How often did you feel tired even when you hadn't done anything?	4.39
FATIMP3	How often did you have to push yourself to get things done because of your fatigue?	4.37
FATIMP16	How often did you have trouble finishing things because of your fatigue?	3.82
FATIMP49	To what degree did your fatigue interfere with your physical functioning?	3.67
FATEXP48	How often did you find yourself getting tired easily?	3.37
FATIMP30	How often were you too tired to think clearly?	3.26
FATIMP33	How often did your fatigue limit you at work (include work at home)?	3.17
FATEXP7	How often did you feel your fatigue was beyond your control?	2.76
FATIMP14	How often did your fatigue make it difficult to organize your thoughts when doing things at work (include work at home)?	2.63
FATEXP26	How often were you too tired to enjoy life?	2.43
FATIMP17	How often did your fatigue make it difficult to make decisions?	2.13
FATEXP34	How tired did you feel on average?	2.09
FATIMP9	How often did you fatigue make it difficult to plan activities ahead of time?	2.09
FATEXP21	How fatigued were you when your fatigue was at its worst?	2.07
FATIMP4	How often did your fatigue interfere with your social activities?	1.93
FATEXP5	How often did you experience extreme exhaustion?	1.93
FATIMP29	How often were you too tired to leave the house?	1.91
FATIMP21	How often were you too tired to take a bath or shower?	1.34
FATIMP15	How often did your fatigue interfere with your ability to engage in recreational activities?	1.15
FATIMP26	How often were you too tired to socialize with your family?	0.67