| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 491093 |
95%
|
| 2 | Some difficulty | 19690 |
3.8%
|
| 3 | A lot of difficulty | 4154 |
0.8%
|
| 4 | Cannot do at all | 608 |
0.1%
|
| 9 | Don't know | 1582 |
0.3%
|
| Sysmiss | 88895 |