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Table 8 Results of item analysis using unidimensional item response theory for each subscale

From: Psychometric evaluation of the Japanese version of the fear of pain questionnaire-III and its association with dental anxiety: a cross-sectional study

Items

Mean

S.D.

Polychoric correlation coefficient

Factor loading

beta.1

beta.2

beta.3

beta.4

discrimination (α)

I. Fear of Severe Pain

1

4.20

1.04

0.78

0.69

-5.74

-3.40

-1.66

-0.06

2.33

3*

3.83

1.04

0.83

0.80

-6.88

-3.89

-0.74

1.77

3.34

5

3.54

1.14

0.75

0.74

-4.71

-1.74

-0.01

1.73

1.90

6

3.90

1.05

0.88

0.88

-8.04

-4.71

-1.41

1.76

4.32

9*

3.89

1.05

0.80

0.77

-5.48

-3.19

-0.82

1.24

2.49

10*

4.01

1.02

0.88

0.84

-7.56

-4.34

-1.46

1.00

3.49

13

4.47

0.86

0.79

0.54

-6.09

-4.58

-2.64

-0.92

2.44

18

3.76

1.14

0.79

0.79

-4.76

-2.26

-0.51

1.28

2.19

25

4.13

1.02

0.68

0.54

-5.41

-2.89

-1.09

0.14

1.46

27

3.61

1.12

0.69

0.64

-3.97

-1.97

-0.04

1.52

1.62

II. Fear of Minor Pain

2

2.69

1.06

0.71

0.67

-2.70

-0.17

2.07

3.56

1.55

4

2.95

1.23

0.77

0.85

-2.67

-0.58

1.09

2.62

1.65

7

2.71

1.18

0.80

0.86

-2.62

-0.22

2.20

3.45

2.09

12

2.76

1.14

0.80

0.86

-3.34

-0.08

2.16

3.77

2.22

19*

2.62

1.17

0.83

0.92

-2.83

0.26

2.37

4.18

2.39

22

3.02

1.16

0.81

0.87

-3.95

-0.69

1.35

2.92

2.05

23*

2.85

1.17

0.80

0.89

-3.34

-0.44

1.86

3.61

2.28

24*

2.46

1.15

0.84

0.91

-2.74

0.64

3.56

5.15

2.99

28

2.39

1.19

0.86

0.97

-2.56

0.95

3.94

5.71

3.46

30

2.51

1.20

0.83

0.93

-2.29

0.26

2.90

4.56

2.61

III. Fear of Medical Pain

8

2.07

1.19

0.76

0.73

-0.52

1.10

2.63

3.66

1.59

11

2.12

1.17

0.78

0.76

-0.77

1.12

2.54

3.96

1.72

14*

2.70

1.30

0.84

1.02

-2.59

-0.09

1.71

3.47

2.49

15

2.92

1.26

0.80

0.95

-3.20

-0.70

1.35

2.89

2.27

16

3.29

1.21

0.79

0.88

-3.97

-1.71

0.46

2.32

2.17

17*

3.26

1.24

0.83

0.96

-4.04

-1.75

0.57

2.42

2.52

20

3.78

1.10

0.74

0.70

-4.98

-2.59

-0.69

1.03

1.73

21*

3.09

1.18

0.83

0.94

-4.63

-1.33

1.22

3.09

2.63

26

3.30

1.22

0.76

0.83

-3.45

-1.64

0.34

2.11

1.86

29

2.84

1.25

0.80

0.91

-2.96

-0.42

1.40

2.93

2.11

  1. * The items are included in FPQ-9