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Table 3 Item characteristics FreBAQ-G

From: Validation and investigation of cross cultural equivalence of the Fremantle back awareness questionnaire - German version (FreBAQ-G)

Nr Item Item dicrimination (a) Item difficulty (b) Info Rank
≥ 1 ≥ 2 ≥ 3 = 4
1 My back feels as though it is not part of the rest of my body 1.57 − 0.07 0.87 2.16 3.91 5
2 I need to focus all my attention on my back to make it move the way I want it to 1.39 −0.89 0.30 1.57 3.15 3
3 I feel as if my back sometimes moves involuntarily, without my control 1.85 −0.09 1.06 2.16 3.91 6
4 When performing everyday tasks, I don’t know how much my back is moving 2.31 −0.26 0.66 1.44 2.80 9
5 When performing everyday tasks, I am not sure exactly what position my back is 2.25 −0.20 0.60 1.35 2.47 8
6 I can’t perceive the exactly outline of my back 2.17 0.34 1.30 1.82 2.70 7
7 My back feels like it is enlarged (swollen) 1.41 0.85 1.66 2.74 4
8 My back feels like it has shrunk 1.30 1.35 2.38 3.66 2
9 My back feels lopsided (asymmetrical) 1.03 −1.26 −0.10 1.24 3.13 1
  1. Item discrimination parameter (a) = higher values means better discrimination; item difficulty parameter (b) = higher values indicate more impairment, categories with higher values are easier; Info rank = higher values indicate more information about back specific self-perception.