Table 2 Item parameters and values for the SS X ² fit index and LR DIF statistics for the potential new items for the anger, anxiety, and depressive symptoms scales

Item Stem

a

b ₁

b ₂

b ₃

b ₄

X ²

d.f.

p

X ²

p

X ²

p

Added to the Anger item bank:

I was angry when things didn't go my way

1.41

-0.8

0.33

1.74

2.60

62

70

0.748

2.6

0.755

5.8

0.328

I wanted to be alone because I was so angry

1.92

-0.51

0.39

1.56

2.64

62

61

0.428

1.3

0.932

3.5

0.621

I was so mad I did not want to talk to people

2.1

-0.25

0.51

1.86

3.01

54

53

0.448

5.3

0.382

2.5

0.772

I had a bad temper

1.69

-0.44

0.60

1.71

2.64

62

67

0.640

9.9

0.079

2.9

0.710

Not added to the Anger item bank (DIF):

I could not control my anger

1.69

0.11

0.96

1.86

2.36

785

59

0.050

16.4

0.006

9.1

0.104

Added to the Anxiety item bank:

I felt too nervous to be with a group of kids my age.

1.34

0.52

1.42

2.81

3.48

77

75

0.401

2.4

0.794

2.0

0.856

I worried that something might happen to my parents or guardians.

1.29

?0.23

0.45

1.73

2.28

121

92

0.024

5.9

0.314

2.1

0.840

Not added to the Anxiety item bank (DIF):

I was too worried to sleep alone.

1.34

0.93

1.79

2.65

3.32

83

60

0.026

3.8

0.576

25.1

0.001

Not added to the Anxiety item bank (LD):

I had trouble falling asleep because I was worried about something.

1.65

-0.13

0.72

2.14

2.91

78

74

0.343

7.6

0.176

3.0

0.707

I was so nervous I felt sick.

1.40

0.59

1.29

2.80

3.86

80

72

0.2332

0.6

0.989

4.1

0.537

I felt sad for no reason.

1.65

0.41

1.19

2.36

3.31

82

70

0.160

7.2

0.124^†

4.9

0.427