| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No, no difficulty | 23710 |
96.3%
|
| 2 | 2. Yes, some | 728 |
3%
|
| 3 | 3. Yes, a lot | 148 |
0.6%
|
| 4 | 4. Cannot see | 46 |
0.2%
|
| Sysmiss | 2789 |