| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. YES, NO DIFFICULTY | 25623 |
97.9%
|
| 2 | 2. YES, SOME | 453 |
1.7%
|
| 3 | 3. YES, A LOT | 72 |
0.3%
|
| 4 | 4. CANNOT SEE | 27 |
0.1%
|
| Sysmiss | 1 |