| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 17888 |
96.9%
|
| 2 | 2. Some difficulty | 392 |
2.1%
|
| 3 | 3. A lot of difficulty | 140 |
0.8%
|
| 4 | 4. Cannot do at all | 28 |
0.2%
|
| 5 | 6. Don't know | 11 |
0.1%
|
| Sysmiss | 4282 |