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