Table 1 Fit to the Rasch model

1 Stress, 6 items

0.48

1.30

−049

1.19

52.79

0.52

0.92

10.5 (9.1;12.0)

2 Stress 2 testlets

0.31

0.56

−0.62

1.03

13.57

0.75

0.87

4.4 (3.0;5.9)

3 Energy, 6 items

−0.008

2.05

−0.43

1.09

70.61

0.06

0.80

8.4 (7.0;9.9)

4 Energy, 4 items

−0.31

2.35

−0.42

0.89

47.76

0.04

0.75

6.1 (4.6;7.5)

5 Energy re-scoring

0.03

2.07

−0.42

1.09

72.17

0.05

0.80

8.3 (6.9;9.8)

6 Energy DIFsplit

−0.13

1.83

−0.42

1.08

74.73

0.15

0.80

7 Energy 2 testlets

0.13

0.33

−0.49

0.83

23.20

0.18

0.70

3.3 (2.2;5.1)

Ideal values

0.0

<1.4

0.0

<1.4

>0.05

>0.7

(LCI <5%)