| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty remembering/concentrating | 8556 |
97.5%
|
| 2 | some difficulty | 131 |
1.5%
|
| 3 | a lot of difficulty | 62 |
0.7%
|
| 4 | cannot remember/concentrate at all | 29 |
0.3%
|
| 8 | don't know | 1 |
0%
|
| Sysmiss | 4170 |