RIS Items | Mean (SD) | Answer distribution (percentage) | Corrected item-total correlation | ||||
---|---|---|---|---|---|---|---|
1–20 min. | 21–40 min. | 41–60 min. | 61–90 min. | 91 min. and more | |||
1. Sleep latency | 1.82 (1.37) | 21.1 | 24.8 | 21.6 | 16.1 | 16.5 | .549 |
7 h and more | 5–6 h | 4 h | 2–3 h | 0–2 h | |||
2. Sleep duration | 1.65 (0.86) | 7.3 | 37.2 | 40.8 | 12.8 | 1.8 | .694 |
Never | Seldom | Sometimes | Mostly | Always | |||
3. My sleep is disturbed | 3.11 (0.97) | 0.5 | 7.3 | 17.4 | 30.7 | 44.0 | .732 |
4. I wake up too early | 2.86 (1.03) | 2.8 | 7.3 | 22.9 | 35.3 | 31.7 | .650 |
5. I wake up from the slightest sound | 2.77 (1.08) | 3.2 | 10.1 | 23.4 | 33.5 | 29.8 | .619 |
6. I feel that I have not slept all night | 2.07 (0.97) | 6.9 | 17.0 | 44.0 | 26.1 | 6.0 | .748 |
7. I think a lot about my sleep | 2.41 (0.92) | 2.8 | 11.5 | 37.6 | 38.1 | 10.1 | .673 |
8. I am afraid to go to bed because of my disturbed sleep | 1.89 (1.24) | 17.0 | 21.1 | 29.8 | 20.6 | 11.5 | .676 |
9. I feel fit during the day | 2.31 (1.03) | 2.3 | 23.9 | 26.6 | 35.3 | 11.9 | .508 |
10. I take sleeping pills in order to get to sleep | 1.7 (1.56) | 35.8 | 12.4 | 18.8 | 12.4 | 20.6 | .519 |