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|
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
|
- 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.
