| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty remembering/concentrating | 45327 |
94.7%
|
| 2 | some difficulty | 1841 |
3.8%
|
| 3 | a lot of difficulty | 563 |
1.2%
|
| 4 | cannot remember/concentrate at all | 112 |
0.2%
|
| 8 | don't know | 8 |
0%
|
| Sysmiss | 8069 |