Table 4 Descriptive statistics of subscales^a

Initial model

(52 items)

# items

10

8

5

8

9

7

5

N

85(24%)

81(28%)

88(21%)

69(38%)

71(37%)

80(29%)

91(19%)

Item mean¤

3.38

3.31

3.50

3.26

3.51

3.8

3.3

Item variance

0.73

0.71

0.63

0.83

0.74

0.49

0.82

Scale mean

33.8

26.4

17.5

26.1

31.6

26.5

16.6

Scale SD

5.4

3.4

2.6

5.7

5.2

3.3

3.7

Theoretical range

0 - 50

0 - 40

0 - 25

0 - 40

0 - 45

0 - 35

0 -25

Average inter-item correlation

(min.; max.)

0.34

(-09;.71)

0.15

(-21;.61)

0.29

(-01;.48)

0.56

(.18; 89)

0.39

(-.22;.75)

0.37

(.09; .66)

0.58

(.38; .73)

Cronbach's alpha

0.83

0.58

0.67

0.91

0.85

0.80

0.87

Long version

(40 items)(

N

89

91

88

70

81

81

91

Score range

8-36

4-18

4-17

7-33

7-34

6-25

5-21

Mean

27.1

13.7

14

22.4

25.1

19

16.6

SD

4.9

2.5

2.3

5.6

4.5

2.8

3.7

# items

8

4

4

7

7

5

5

Items included

1,2,5-10

13,16, 18,11

19-21, 23

24,25, 27-31

32-35, 38-40

41-43, 46,47

48-52

Cronbach's alpha

0.86

0.70

0.71

0.93

0.87

0.82

0.87

Short version

(30 items)

N

90

91

88

74

83

86

92

Score range

5-23

3-14

4-17

5-23

5-25

4-20

4-17

Mean

16.9

10.2

14

16.2

18.2

15.4

12.9

SD

3.5

2.1

2.3

4.1

3.5

2.3

3.2

# items

5

3

4

5

5

4

4

Items included

1,2,5,7, 10

13,16, 18 (11)

19-21, 23

25,27-31

34,35,

38-40

41-43, 47

48-51

Cronbach's alpha

0.85

0.75

0.71

0.92

0.89

0.81

0.87

Correlation with long version ¹

0.95

0.96

0.93

0.98

0.96

0.98

0.98

N = 115

N = 111

N = 107

N = 105

N = 105

N = 104

N = 111