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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