| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 9247 |
94.2%
|
| 2 | Some difficulty | 434 |
4.4%
|
| 3 | A lot of difficulty | 111 |
1.1%
|
| 4 | Cannot remember things at all | 28 |
0.3%
|
| Sysmiss | 3679 |