Table 2.

Between-group comparison of Study 1 samples on items from the Glasgow Sleep Effort Scale^a

	Psychophysiologic insomnia (n = 20)	Idiopathic insomnia (n = 20)
Glasgow sleep effort scale
1. I put too much effort into sleeping when it should come naturally	1.10 (0.79)	0.70 (0.73)
2. I feel I should be able to control my sleep	1.15 (0.59)	0.90 (0.64)
3. I put off going to bed at night for fear of not being able to sleep	0.50 (0.61)	0.75 (0.72)
4. I worry about not sleeping if I cannot sleep	1.35 (0.59)	1.05 (0.76)
5. I am no good at sleeping	1.20 (0.69)	1.70 (0.57)
6. I get anxious about sleeping before I go to bed	0.80 (0.69)	0.30 (0.57)
7. I worry about the consequences of not sleeping	1.40 (0.68)	0.90 (0.64)

^aAll data represent mean (SD), unless otherwise stated.