| Value | Category | Cases | |
|---|---|---|---|
| 1 | No no difficulty | 13410 |
97.6%
|
| 2 | Yes some difficulty | 227 |
1.7%
|
| 3 | Yes a lot of difficulty | 77 |
0.6%
|
| 4 | Cannot concentrate or remember at all | 30 |
0.2%
|
| Sysmiss | 8 |