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Table 4 Item difficulties and discriminatory power of parallel items of both test versions after training

From: Traffic safety knowledge gain of ambulance drivers after simulator-based training

A B
Item Difficulty SD discriminatory power Item Difficulty SD discriminatory power
1 12.50 0.33 0.104 12 36.96 0.49 0.145
2b 10.42 0.31 0.154 17b 17.39 0.38 0.223
3 89.58 0.31 0.054 18 21.74 0.42 0.242
4 47.92 0.50 0.163 1 52.17 0.51 0.183
5 33.33 0.48 0.001 14 65.22 0.48 0.225
6 37.50 0.49 −0.145 5 30.43 0.47 0.389
7 85.42 0.36 0.070 15 80.43 0.40 0.176
8 33.33 0.48 0.026 11 39.13 0.49 0.051
9a 89.58 0.25 0.019 6a 77.17 0.33 0.066
10 50.00 0.51 0.052 4 39.13 0.49 0.071
11 56.25 0.50 0.001 8 45.65 0.50 −0.028
12 22.92 0.42 0.161 7 10.87 0.31 0.165
13 33.33 0.48 0.207 19 17.39 0.38 0.331
14 37.50 0.49 −0.110 2 34.78 0.48 −0.055
15 18.75 0.39 0.003 10 21.74 0.42 0.198
16 22.92 0.42 −0.117 16 30.43 0.47 0.023
17a 70.00 0.28 0.053 13a 79.57 0.19 0.115
18 45.83 0.50 0.008 3 43.48 0.50 0.028
19 41.67 0.50 0.143 9 26.09 0.44 0.253
  1. Note: n = 94 participants (intervention group); Number of test item in A matches the number of test B in the same line
  2. amultiple correct answer options
  3. bsort answers in right order; rest- five response options, item difficulty is the proportion of people answering the item correctly, that is, the higher the value the easier is the question; item difficulty usually has no unit but describes percentages