| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 35426 |
87.2%
|
| 2 | SOME DIFFICULTY | 3397 |
8.4%
|
| 3 | A LOT OF DIFFICULTY | 510 |
1.3%
|
| 4 | CANNOT REMEMBER THINGS AT ALL | 174 |
0.4%
|
| Sysmiss | 1110 |
2.7%
|