| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 18064 |
97.9%
|
| 2 | 2. Some difficulty | 225 |
1.2%
|
| 3 | 3. A lot of difficulty | 115 |
0.6%
|
| 4 | 4. Cannot do at all | 45 |
0.2%
|
| 5 | 6. Don't know | 10 |
0.1%
|
| Sysmiss | 4282 |