Question 1

How do PROMIS Sleep-Related Impairment T-scores translate to clinical severity?

Accepted Answer

T-scores below 55 are within normal limits, 55-59.9 indicate mild impairment, 60-69.9 moderate, and 70+ severe. An important caveat: PROMIS sleep measures were calibrated on a sample enriched for chronic illness, so T-score 50 represents that calibration sample average, not the general population.

Question 2

What is the difference between Sleep Disturbance and Sleep-Related Impairment?

Accepted Answer

Sleep Disturbance assesses the nighttime experience (quality, depth, difficulty falling/staying asleep). Sleep-Related Impairment assesses daytime consequences (alertness, sleepiness, functional impairment). They measure complementary dimensions and are often administered together. A patient may score high on one but not the other.

Question 3

What clinical actions are recommended at different severity levels?

Accepted Answer

Below 55 (normal): no intervention needed. 55-59.9 (mild): sleep hygiene education. 60-69.9 (moderate): clinical evaluation and CBT-I should be considered. 70+ (severe): comprehensive sleep evaluation including polysomnography may be warranted.

Question 4

Is this measure sensitive to treatment change?

Accepted Answer

Yes. It demonstrates acceptable test-retest reliability (ICC 0.62-0.71) and responsiveness in clinical trials. A T-score change of 3-5 points is generally considered a minimally important difference. Cronbach's alpha of 0.89-0.92 indicates strong internal consistency suitable for tracking change.

Question 5

What does my PROMIS Sleep-Related Impairment score mean?

Accepted Answer

We have a detailed scoring guide that explains how to interpret your PROMIS Sleep-Related Impairment results, including severity ranges and recommended clinical actions. Read our full scoring guide.

PROMIS Sleep-Related Impairment

Take the PROMIS Sleep-Related Impairment assessment. 8-item NIH-validated measure of daytime sleepiness, fatigue, and functional impairment from poor sleep.

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