Table 3:
Graded Response Model parameter estimates for 14 questions of MVRAQ.
| Item | Question | α | β1 | β2 | β3 |
|---|---|---|---|---|---|
| Rod-function anxiety | |||||
| Q01 | Worry bumping into people/objects during the night | 3.64 | −0.15 | 0.48 | 0.97 |
| Q02 | Worry bumping into people/objects in poorly lit areas | 3.74 | −0.19 | 0.47 | 1.02 |
| Q03 | Worry about seeing during the night | 9.12 | −0.17 | 0.26 | 0.78 |
| Q04 | Worry about seeing in poorly lit areas | 10.34 | −0.23 | 0.24 | 0.67 |
| Q05 | Worry about uneven ground during the night | 7.48 | −0.32 | 0.14 | 0.51 |
| Q06 | Worry about uneven ground in poorly lit areas | 7.28 | −0.34 | 0.15 | 0.52 |
| Cone-function anxiety | |||||
| Q01 | Worry when reading up close | 1.73 | 0.30 | 1.21 | 1.69 |
| Q02 | Worry when reading at a distance | 1.52 | −0.65 | 0.70 | 1.69 |
| Q03 | Worry when distinguishing colors | 3.50 | 0.39 | 1.15 | 1.78 |
| Q04 | Worry when seeing against similar backdrops | 3.90 | 0.06 | 0.97 | 1.53 |
| Q05 | Worry about recognizing faces | 2.44 | 0.32 | 0.94 | 1.50 |
| Q06 | Worry when going to unfamiliar places during the day | 1.94 | −0.24 | 0.66 | 1.19 |
| Q07 | Worry about bright fluorescent lights | 1.91 | 0.42 | 1.26 | 1.81 |
| Q08 | Worry about going out on bright sunny days | 1.52 | 0.81 | 1.71 | 2.40 |