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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