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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.
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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