Table 3.

Frequency of PROMIS Sleep Assessments T-Scores

	Clinical (n = 98)	Healthy control (n = 22)
PROMIS Sleep Disturbance T-Scores
Within the normal limits	79 (80.6%)	20 (90.9%)
Mild sleep disturbance	10 (10.2%)	2 (9.1%)
Moderate sleep disturbance	7 (7.1%)	–
Severe sleep disturbance	2 (2.0%)	–
PROMIS Sleep-Related Impairment T-Scores
Within the normal limits	60 (61.2%)	19 (86.4%)
Mild sleep-related impairment	19 (19.4%)	2 (9.1%)
Moderate sleep-related impairment	16 (16.3%)	1 (4.5%)
Severe sleep-related impairment	3 (3.1%)	-

Note: PROMIS = Patient-Reported Outcomes Measurement Information System. The T-score distribution has a mean of 50 and a standard deviation of 10 [39, 62]. The cut-points of mild, moderate, and severe correspond to 0.5, 1.0, and 2.0 standard deviations above the mean of the normative adult sample, respectively [65].