Table 4.

PROMIS scale T-score characteristics in CLUES cohort

	Mean ± SD	% at floor	% at ceiling	Cronbach’s alpha
Physical Health
Physical Function	47.4 ± 9.9	0.2	20.2	.94
Pain Interference	52.4 ± 10.0	0.5	3.3	.95
Fatigue	52.5 ± 11.6	5.4	0.5	.96
Sleep Disturbance	52.7 ± 9.1	2.3	3.7	.80
Sleep Impairment	52.9 ± 10.7	0.3	4.5	.92
Mental Health
Cognition, Ability	48.7 ± 8.5	2.2	14.7	.90
Psychosocial Illness Impact, Negative	52.1 ± 8.2	0.3	12.3	.78
Psychosocial Illness Impact, Positive	48.2 ± 9.1	0.6	21.7	.79
Social Health
Ability to Participate Social Roles, Activities	50.5 ± 10.0	3.2	24.8	.96
Satisfaction, Discretionary Social Activities	52.8 ± 10.0	1.8	20.0	.95
Satisfaction, Social Roles	51.1 ± 10.7	2.3	24.1	.96
Social Isolation	46.3 ± 9.4	0.5	27.5	.90

Note: For PROMIS scales, higher T-scores reflect “more” of the domain being measured; i.e., better physical function, more pain interference. Because the directionality of scores is not consistent in terms of “best” or “worst” scores, we defined floor and ceiling to have a consistent meaning. Floor = worst score, Ceiling = best score.

All item-total correlations >0.50 except:

Physical Function: limitations in vigorous activity (r = .48)

Sleep Impairment: “I felt alert when I woke up” (r = .39)

PIN: “I worry about the future” (r = 0.44)