| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 503583 |
97.4%
|
| 2 | Some difficulty | 8503 |
1.6%
|
| 3 | A lot of difficulty | 2092 |
0.4%
|
| 4 | Cannot do at all | 1391 |
0.3%
|
| 9 | Don't know | 1558 |
0.3%
|
| Sysmiss | 88895 |