Table 3.
Fit statistics of the National Eye Institute Visual Function Questionnaire 25 items included in the final model
| No. | Itema | Measure (logits) | SE | Infit MNSQ | Outfit MNSQ |
|---|---|---|---|---|---|
| 9 | Going down stairs at night | 1.10 | 0.11 | 1.08 | 1.19 |
| 6 | Seeing well up close | 0.80 | 0.10 | 0.92 | 0.95 |
| 5 | Reading normal print | 0.57 | 0.10 | 0.93 | 0.91 |
| 10 | Seeing objects off to side | 0.32 | 0.10 | 1.04 | 1.11 |
| 14 | Going out to movies/plays | 0.30 | 0.13 | 1.12 | 0.94 |
| 8 | Reading street signs | −0.13 | 0.12 | 1.16 | 1.05 |
| 7 | Finding objects on crowded shelf | −0.18 | 0.11 | 0.85 | 0.79 |
| 13 | Visiting others | −0.70 | 0.12 | 0.89 | 0.74 |
| 11 | Seeing how people react | −0.74 | 0.11 | 0.90 | 0.84 |
| 12 | Difficulty matching clothes | −1.33 | 0.14 | 1.12 | 1.08 |
MNSQ = mean square.
a
The most difficult item is at the top and the least difficult item at the bottom of the table.