Table 3 Means, standard deviations, item difficulty (a), and discrimination (b) of the 10 items in the OFS

1

3.98 (.84)

1.48

−6.24

− 3.31

− 1.89

1.46

3.18 (1.23)

1.72

−3.04

−1.07

.29

2.59

2

3.97 (.93)

2.16

−6.41

− 3.61

− 2.12

1.50

3.09 (1.26)

2.28

−3.22

−1.05

.55

3.05

3

3.89 (.91)

1.68

−5.66

−3.17

−1.67

1.69

2.76 (1.24)

2.08

−2.26

−.27

1.15

3.92

4

4.02 (.94)

1.47

−5.06

−3.35

−1.54

.91

3.10 (1.22)

1.66

−2.66

−1.07

.53

2.73

5

4.36 (.85)

1.32

−5.48

−3.74

−2.46

−.17

3.32 (1.38)

1.68

−2.50

−1.12

−.17

1.67

6

3.60 (1.26)

.83

−3.07

−1.32

−0.44

.87

2.94 (1.41)

.63

−1.52

−.19

.49

1.54

7

4.01 (.98)

1.04

−4.93

−2.57

−1.37

.71

3.21 (1.35)

1.59

−2.49

−1.05

.22

1.86

8

4.27 (.78)

2.46

−8.62

−5.70

−3.48

.57

3.42 (1.25)

2.78

−4.36

−2.01

−.34

2.61

9

4.11 (.99)

.92

−4.57

−2.63

−1.45

.35

3.83 (1.19)

1.32

−3.16

−2.26

−.91

.82

10

4.07 (.82)

1.36

−5.46

−3.93

−1.96

1.06

3.45 (1.18)

1.94

−3.43

−2.05

−.32

2.36