. Author manuscript; available in PMC: 2020 Jan 1.

Published in final edited form as: J Alzheimers Dis. 2019;69(1):111–121. doi: 10.3233/JAD-180291

Table 2.

Medical Outcomes Study Sleep Scale

	Sleep Problems Index I
During the past 4 weeks…
1. How long did it usually take for you to fall asleep?^a
2. On the average, how many hours did you sleep each night?^b
How often did you…^c
3. Feel that your sleep was not quiet (moving restlessly, feeling tense, speaking, and so forth, while sleeping)?
4. Get enough sleep to feel rested upon waking in the morning?	o
5. Awaken short of breath or with a headache?	o^†
6. Feel drowsy or sleepy during the day?
7. Have trouble falling asleep?	o^†
8. Awaken during your sleep time and have trouble falling asleep again?	o^†
9. Have trouble staying awake during the day?	o^†
10. Snore during your sleep?
11. Take naps (5 min or longer) during the day?
12. Get the amount of sleep you needed?	o

Responses were converted to a 0–100 scale and summed and averaged to produce the total SPI score. Thus, higher scores indicate greater sleep problems.

o indicates item included in SPI score

^†

indicates item was reversed-scored before computing SPI score

Responses were on 15-minute increments from 1 (0–15 minutes) to 5 (more than 60 minutes).

Responses were free entry.

Responses were on a 6-point scale from 1 (all of the time) to 6 (none of the time).

SPI=Sleep Problems Index I