Table 4 Exploratory Factor Analysis one factor model

1

I feel tired and unrefreshed when I wake from sleeping.

2.24

.84

.50

2

My muscles feel stiff and achy.

2.38

.83

.49

3

I have anxiety attacks.

1.03

.94

.58

4

I grind or clench my teeth.

1.19

1.12

.32

5

I have problems with diarrhea and/or constipation.

1.51

.93

.43

6

I need help in performing my daily activities.

.25

.53

.43

7

I am sensitive to bright lights.

1.24

1.16

.46

8

I get tired very easily when I am physically active.

1.38

1.00

.60

9

I feel pain all over my body.

.75

.94

.56

10

I have headaches.

1.42

.81

.50

11

I feel discomfort in my bladder and/or burning when I urinate.

0.36

.70

.40

12

I do not sleep well.

1.98

0.92

.50

13

I have difficulty concentrating.

1.66

.83

.58

14

I have skin problems such as dryness, itchiness,or rashes.

1.52

1.07

.48

15

Stress makes my physical symptoms get worse.

2.14

1.06

.64

16

I feel sad or depressed.

1.42

.79

.56

17

I have low energy.

1.88

.77

.64

18

I have muscle tension in my neck and shoulders.

2.36

.95

.60

19

I have pain in my jaw.

.88

1.01

.53

20

Certain smells, such as perfumes, make me feel dizzy and nauseated.

.97

1.17

.49

21

I have to urinate frequently.

1.54

1.14

.43

22

My legs feel uncomfortable and restless when I am trying to go to sleep at night.

.93

0.99

.42

23

I have difficulty remembering things.

1.51

.86

.52

24

I suffered trauma as a child.

.96

1.16

.42

25

I have pain in my pelvic area.

2.10

1.18

.30