| Value | Category | Cases | |
|---|---|---|---|
| 0 | No - no difficulty | 1129015 |
98.9%
|
| 1 | Some difficulty | 4897 |
0.4%
|
| 2 | A lot of difficulty | 5697 |
0.5%
|
| 3 | Cannot remembering or concentrating at all | 1634 |
0.1%
|
| 9 | 14 |
0%
|
|
| Sysmiss | 171758 |