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Table 3 Two-factor solution: Factor loadings and communalities by principal components from the SHI

From: Psychometric evaluation of the sleep hygiene index: a sample of patients with chronic pain

 

Factor loadings

 

Item content

1

2

h 2

10. I sleep on an uncomfortable bed (for example: poor mattress or pillow, too much or not enough blankets).

.77

.06

.60

11. I sleep in an uncomfortable bedroom (for example: too bright, too stuffy, too hot, too cold, or too noisy).

.74

-.02

.55

12. I do important work before bedtime (for example: pay bills, schedule, or study).

.65

-.12

.43

7. I do something that may wake me up before bedtime (for example: play video games, use the internet, or clean).

.51

.23

.31

6. I use alcohol, tobacco, or caffeine within 4 hours of going to bed or after going to bed.

.50

.04

.25

13. I think, plan, or worry when I am in bed.

.49

.20

.28

9. I use my bed for things other than sleeping or sex (for example, watch television, read, eat, or study).

.43

.26

.25

4. I exercise to the point of sweating within 1 hour of going to bed.

.14

.06

.02

3. I get out of bed at different times from day to day.

.13

.83

.70

2. I go to bed at different times from day to day.

.13

.82

.69

5. I stay in bed longer than I should two or three times a week.

.06

.74

.55

1. I take daytime naps lasting two or more hours.

.00

.50

.25

8. I go to bed feeling stressed, angry, upset, or nervous.

.34

.46

.33

  1. Note: Bold number indicates salient factor loading (≥.32); h2 indicates item communalities; SHI: Sleep Hygiene Index.