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Table 4 The BIST Conversion Scale - the raw score and corresponding logits and interval score for 15-items

From: Rasch analysis of the Brain Injury Screening Tool (BIST) in mild traumatic brain injury

Raw Score

Logits

Interval Score

Raw Score

Logits

Interval Score

Raw Score

Logits

Interval Score

0

−3.208

0.00

16

−0.41

20.47

32

0.513

27.23

1

−2.585

4.56

17

−0.348

20.93

33

0.58

27.72

2

−2.164

7.64

18

−0.289

21.36

34

0.651

28.24

3

−1.879

9.72

19

−0.231

21.78

35

0.727

28.79

4

−1.658

11.34

20

−0.174

22.20

36

0.809

29.39

5

−1.477

12.67

21

−0.118

22.61

37

0.899

30.05

6

−1.323

13.79

22

−0.063

23.01

38

1.001

30.80

7

−1.188

14.78

23

−0.008

23.41

39

1.117

31.65

8

−1.069

15.65

24

0.047

23.82

40

1.254

32.65

9

−0.962

16.43

25

0.103

24.23

41

1.418

33.85

10

−0.865

17.14

26

0.158

24.63

42

1.623

35.35

11

−0.776

17.80

27

0.214

25.04

43

1.896

37.35

12

−0.693

18.40

28

0.271

25.46

44

2.311

40.38

13

−0.616

18.97

29

0.329

25.88

45

2.942

45.00

14

−0.543

19.50

30

0.388

26.31

   

15

−0.475

20.00

31

0.449

26.76