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Table 2 Means and standard deviations and percentages in RIS in 218 patients with psychophysiological insomnia

From: Regensburg Insomnia Scale (RIS): a new short rating scale for the assessment of psychological symptoms and sleep in insomnia; Study design: development and validation of a new short self-rating scale in a sample of 218 patients suffering from insomnia and 94 healthy controls

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
  1. * Item-total correlations relate to the full scale and not the four subscales.