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Table 3 Psychometric Properties of the OKAT by Item

From: The design of a valid and reliable questionnaire to measure osteoporosis knowledge in women: the Osteoporosis Knowledge Assessment Tool (OKAT)

Item Number Index of Difficulty Item Discrimination (%) Item-total correlation Cronbach's alpha* Factor Loading
1 0.97 12 0.17 0.69 0.21
2 0.37 63 0.33 0.68 0.42
3 0.43 63 0.34 0.68 0.43
4 0.91 21 0.22 0.69 0.27
5 0.60 67 0.37 0.67 0.46
6 0.20 0.47 0.33 0.68 0.41
7 0.39 35 0.13 0.70 0.15
8 0.27 45 0.27 0.68 0.32
9 0.26 24 0.14 0.70 0.14
10 0.80 17 0.03 0.70 0.03
11 0.12 28 0.21 0.69 0.27
12 0.66 47 0.26 0.68 0.32
13 0.27 53 0.32 0.68 0.37
14 0.67 61 0.34 0.68 0.41
15 0.52 53 0.28 0.68 0.34
16 0.50 70 0.40 0.67 0.46
17 0.24 48 0.30 0.68 0.36
18 0.06 17 0.22 0.70 0.26
19 0.30 60 0.35 0.68 0.42
20 0.29 50 0.27 0.68 0.33
  1. *gives Cronbach's alpha with each item omitted in turn.