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Table 2 Item analysis

From: Sexuality and contraceptive knowledge in university students: instrument development and psychometric analysis using item response theory

Item Difficulty index Discriminant index
1a 0.87 0.1
2a 0.99 0
3a 0.99 0
4b 0.84 0.1
5a 0.98 0.05
6a 0.99 0.025
7a 0.9 −0.05
8b 0.88 0.15
9a 0.98 0
10a 0.96 0.05
11b 0.18 0.33
13 0.19 0.25
15b 0.3 0.23
16b 0.26 0.43
18a 0.36 0.43
19 0.55 0.6
25a 0.83 0.1
26 0.58 0.43
27 0.34 0.3
28 0.61 0.58
29b 0.17 0.025
30 0.25 0.43
31 0.32 0.48
32 0.41 0.68
33 0.11 0.23
34 0.34 0.53
35a 0.11 0.1
36a 0.98 0
37a 0.80 0.1
  1. aDeleted items
  2. bSelected items with modifications