| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO, NO DIFFICULTY | 26672 |
98.4%
|
| 2 | YES, SOME | 338 |
1.2%
|
| 3 | YES, A LOT | 51 |
0.2%
|
| 4 | CANNOT SEE | 53 |
0.2%
|
| Sysmiss | 1238 |