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Table 2 Item difficulty and discriminatory power

From: Comprehension of confidence intervals - development and piloting of patient information materials for people with multiple sclerosis: qualitative study and pilot randomised controlled trial

 

Item 1

Item 2

Item 3

Item 4

Item 5

Item 6

Mean item difficulty (SD)

 IG (N = 36)

0.94 (0.23)

0.80 (0.40)

0.75 (0.44)

0.43 (0.51)

0.86 (0.35)

0.92 (0.28)

 CG (N = 36)

0.68 (0.48)

0.86 (0.36)

0.54 (0.51)

0.36 (0.49)

0.5 (0.51)

0.82 (0.39)

Discriminatory power

 IG (N = 36)

0.17

0.33

0.41

0.45

0.27

0.23

 CG (N = 36)

- 0.15

- 0.04

0.28

0.23

0.10

0.14

  1. IG intervention group, CG control group