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Table 2 Item difficulty and fit statistics of the 10 items of ODI

From: Measurement precision of the disability for back pain scale-by applying Rasch analysis

Item

Difficulty logit

SE logit

Infit MNSQ

Outfit MNSQ

ODI 2: Personal care

0.84

0.05

0.87

0.89

ODI 7: Sleeping

0.61

0.06

1.40

1.49

ODI 5: Sitting

0.34

0.05

1.29

1.39

ODI 4: Walking

0.26

0.05

0.77

0.75

ODI 1: Pain intensity

−0.10

0.06

1.26

1.21

ODI 9: Social life

−0.17

0.05

0.80

0.78

ODI 8: Sex life

−0.32

0.07

1.03

1.06

ODI 6: Standing

−0.48

0.05

0.79

0.75

ODI 10: Traveling

−0.48

0.05

0.74

0.71

ODI 3: Lifting

−0.49

0.05

1.14

1.20