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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.