| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 1 |
0%
|
| 3 | A LOT OF DIFFICULTY | 3 |
0.1%
|
| 4 | CANNOT WALK AT ALL | 4 |
0.1%
|
| Sysmiss | 3721 |
99.8%
|