| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty remembering/concentrating | 6260 |
98.2%
|
| 2 | some difficulty | 69 |
1.1%
|
| 3 | a lot of difficulty | 27 |
0.4%
|
| 4 | cannot remember/concentrate at all | 16 |
0.3%
|
| 8 | don't know | 0 |
0%
|
| Sysmiss | 6577 |