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Table 4 Discrimination parameter, threshold indices, and goodness-of-fit index for the items of the self-report form of the PedsQL 4.0

From: Health-related quality of life in Iranian adolescents: a psychometric evaluation of the self-report form of the PedsQL 4.0 and an investigation of gender and age differences

 

Discrimination

Threshold indices

S-χ2

p

a

b1

b2

b3

b4

Physical functioning

 Item 1

1.19

− 4.18

− 3.08

− 1.65

− 1.01

55.63

0.16

 Item 2

1.83

− 2.79

− 1.98

− 1.12

− 0.46

68.09

0.15

 Item 3

2.03

− 3.20

− 2.01

− 1.23

− 0.83

44.78

0.48

 Item 4

1.45

− 3.15

− 2.08

− 0.95

− 0.32

79.84

0.09

 Item 5

2.01

− 3.25

− 3.04

− 2.22

− 1.83

23.28

0.03

 Item 6

2.10

− 3.21

− 2.19

− 1.32

− 0.78

43.42

0.37

 Item 7

2.08

− 2.74

− 2.29

− 1.41

− 0.83

45.48

0.19

 Item 8

3.02

− 2.37

− 1.95

− 1.10

− 0.63

42.50

0.41

Emotional functioning

 Item 1

2.07

− 3.02

− 2.17

− 1.06

− 0.49

63.10

0.08

 Item 2

1.99

− 2.81

− 1.73

− 0.82

− 0.28

54.99

0.48

 Item 3

2.46

− 2.29

− 1.62

− 0.81

− 0.28

56.00

0.26

 Item 4

1.90

− 2.50

− 1.90

− 1.33

− 0.76

66.37

0.04

 Item 5

2.29

− 2.21

− 1.41

− 0.56

− 0.08

69.91

0.16

Social functioning

 Item 1

1.64

− 2.79

− 1.96

− 1.03

 

22.00

0.97

 Item 2

1.82

− 3.14

− 2.19

− 1.32

 

36.57

0.05

 Item 3

2.28

− 2.86

− 2.27

− 1.40

− 0.83

38.47

0.45

 Item 4

2.25

− 2.72

− 2.25

− 1.85

− 1.18

36.67

0.13

 Item 5

2.59

− 2.49

− 2.19

− 1.49

− 0.96

39.00

0.18

School functioning

 Item 1

2.72

− 2.33

− 2.08

− 1.03

− 0.36

46.38

0.50

 Item 2

2.28

− 2.32

− 1.85

− 0.94

− 0.06

60.29

0.17

 Item 3

2.56

− 2.28

− 1.71

− 1.00

− 0.36

52.22

0.18

 Item 4

1.08

− 4.27

− 3.32

− 1.90

− 0.83

56.98

0.33

 Item 5

1.09

− 3.67

− 3.04

− 1.39

− 0.40

95.26

0.009

  1. PedsQL 4.0 = Pediatric quality of life inventory version 4.0