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Table 2 Basic information on scales and descriptive item statistics

From: Mapping associations between anxiety and sleep problems among outpatients in high-altitude areas: a network analysis

Scale

Symptoms

Items

Mean

SD

Skewness

Kurtosis

GAD-7

Nervousness

1. Feeling nervous, anxious or on edge

1.35

1.07

0.29

-1.15

Uncontrollable Worry

2. Not being able to stop or control worrying

1.03

1.05

0.67

-0.78

Excessive Worry

3. Worrying too much about different things

1.12

1.01

0.57

-0.77

Trouble relaxing

4. Trouble relaxing

1.03

1.05

0.68

-0.76

Restlessness

5. Being so restless that it is hard to sit still

0.77

0.98

1.06

-0.03

Irritability

6. Becoming easily annoyed or irritable

1.07

1

0.63

-0.65

Feeling afraid

7. Feeling afraid as if something awful might happen

0.59

0.88

1.44

1.13

PSQI

Subjective sleep quality

1. During the past month, how would you rate your sleep quality overall?

1.98

1.02

-0.69

-0.66

Sleep latency

2. How long (in minutes) has it taken you to fall asleep each night?

1.99

1.07

-0.58

-1.04

3. During the past month, how often have you had trouble sleeping because a) you cannot get sleep within 30 minutes.

Sleep duration

4. How many hours of actual sleep do you get at night?

1.97

1.21

-0.73

-1.1

Sleep efficiency

5. When have you usually gone to bed?

1.72

1.27

-0.3

-1.6

Sleep disturbance

6. During the past month, how often have you had trouble sleeping because you:

1.31

0.66

0.42

0.24

b) wake up in the middle of the night or early morning

c) have to get up to use the bathroom

d) cannot breathe comfortably

e) cough or snore loudly

f) feel too could

g) feel too hot

h) have bad dreams

i) have pain

j) other reasons

Use of sleep medication

7. During the past month, how often have you taken medicine?

1.09

1.35

0.55

-1.56

Daytime dysfunction

8. During the past month, how often have you had trouble staying awake while driving, eating meals or engaging in social activity?

2.12

0.99

-0.76

-0.63

9. During the past month, how much of problems has it been for you to keep up enthusiasm to get things done?

  1. Note: SD: standard deviation; GAD-7: The seven-item Generalized Anxiety Disorder Scale; PSQI: the Pittsburgh Sleep Quality Index